Answer:
costimulatory reaction between a signaling protein known as B7
The connection between CD4 and the MHC II protein and the engagement of the T cell receptor with processed antigen.
What is the stimulation of a T cell?A CD4 receptor can be found on the surface of helper T-cells. Major Histocompatibility Complex (MHC) class II molecules and the CD4 receptor interact.
T helper cells are activated by the interaction between T-cell receptors (TCR) and peptide MHC class II molecules (pMHC II),
Which are expressed on the surface of antigen-presenting cells (APCs). such as DCs, mononuclear phagocytes, some endothelial cells, thymic epithelial cells, and B cells.
Therefore, CD4 and the MHC II, interaction is involved in the stimulation of a helper t cell.
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what feature of fats makes them hydrophobic
Assuming ri, r2 are negative constants and that $1,2, and $2,1 are positive constants, what do the following equations represent? 1 dN1 = ri + $1,2N2 Ni dt 1 dN2 = r2 + 82,1N1 N2 dt a. Competition b. Predation c. Facultative mutualism d. Obligate mutualisme.
Assuming a, r2 are negative constants and that $1,2, and $2,1 are superb constants choice D obligates mutualism.
D. Obligate mutualisme.
crosses x-axis --> 1 species relies upon on the alternative/ negative population increase at some unspecified time in the future.
The negative constant time period is n. If n is wonderful, the graph of a line with slope m intersects the y-axis above the starting place at (0, n) If n is bad, the graph of a line with slope m intersects the y-axis under the foundation, at (0, n). The phrase "tremendous linear feature" isn't used.
The regular can be high quality or negative. If for a few purposes we already know it is able to simplest have values such as 1 and –1, we may say it equals ±1. Mathematical symbols are used mostly for comfort they do not make anything greater correct.
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classify each mutation example as definitely positive, definitely negative, or most likely neutral. each category has two examples. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. beneficial mutations neutral mutations harmful mutations answer bank
A beneficial mutation is one that has a good effect on an organism. These mutations are uncommon yet important. The benefit that a beneficial mutation provides the organism is passed down from generation to generation, increasing the chances of survival for the offspring.
Neutral mutations:
Neutral mutations are changes in DNA sequence that are neither beneficial nor harmful to an organism's ability to survive and reproduce. In population genetics, neutral mutations are mutations in which natural selection has no effect on the spread of the mutation in a species.
Harmful mutations: Mutations that are harmful can result in genetic diseases or cancer. A genetic condition is an illness that results from a mutation in one or more genes. Cystic fibrosis is a human example. A single gene mutation causes the body to produce thick, sticky mucus, which clogs the lungs and blocks ducts in digestive organs.
What is mutation?
A mutation is a change in an organism's DNA sequence. Mutations can occur as a result of errors in DNA replication during cell division, mutagen exposure, or viral infection.
What causes mutation?
Mutations can occur as a result of mistakes in DNA replication during cell division, mutagen exposure, or viral infection. Germline mutations (those that occur in eggs and sperm) can be handed on to offspring, but somatic mutations (those that originate in body cells) cannot.
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Full Question: Classify each mutation example as definitely positive, definitely negative, or most likely neutral. Each category has two examples.
concept map connective tissues
Connective tissues are tissues that supports, protects, and gives structure to other tissues and organs in the body. All other types of tissues in the body are supported by connective tissues, which joins or divides them.
Like all tissue types, it is made up of cells encased in a space of liquid known as the extracellular matrix (ECM). In contrast to other types of tissue, connective tissue's cells are loosely rather than densely packed within the ECM.
Types of connective tissueTwo distinct forms of connective tissue are distinguished based on the cells present and the ECM structure.
Connective tissue proper; further broken down into loose and dense connective tissues.Specialised connective tissue; adipose tissues, cartilage, bone, blood, and reticular.learn more about connective tissues here;
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unlike b lymphocytes, t lymphocytes do not generate a secreted form of their antigen receptors
Self-reactive antigen receptors may be produced by the random process that produces lymphocyte antigen receptors.Several of these possibly self-reactive lymphocytes are removed during lymphocyte development,
Why does the antigen receptor exist?It serves as a receptor that identifies and binds antigen through the exposed V regions on the cell's surface, sending a signal that activates B cells, triggering clonal growth and the production of specific antibodies.
Describe the three antigen receptors?A co-receptor complex made up of at least three cell-surface molecules—CD19, CD21, and CD81—modifies the signaling of B-cell antigen receptors.
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art-labeling activity main nerves of the brachial plexus
The art-labeling activity main nerves of the brachial plexus is given in the image attached.
How many nerves does the brachial plexus have?There are five main nerve branches that branch off from the brachial plexus and travel down the arm: cutaneous nerve of the muscles: flexes muscles in the upper arm at the shoulder and elbow and originates from nerve roots C5 to C7.
The radial, musculocutaneous, median, ulnar, and axillary nerves are the brachial plexus' five terminal branches.
Note that the network of nerves called the brachial plexus is what carries signals from the spinal cord to the shoulder, arm, and hand. A brachial plexus injury happens when these nerves are compressed, stretched, or in the most severe scenarios, torn apart or severed from the spinal cord.
Therefore, one can say that for the motor and sensory innervation of the upper extremities, including the shoulder, arm, and hand, the brachial plexus is said to be a significant network of nerves that transmits signals.
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sexual reproduction in humans .group of answer choicesallows a haploid sperm cell to fertilize a haploid egg cellproduces a haploid individualproduces an individual with 23 chromosomescombines two diploid gametes, producing a zygote
Sexual reproduction in humans is A. allows a haploid sperm cell to fertilize a haploid egg.
The human reproductive system occurs through the fertilization process, namely the meeting of male gametes and female gametes. The fertilization process will produce a zygote, the zygote then undergoes embryonic development until it is born as a child.
The fertilization process begins with the maturation of the egg and spermatozoa. During ovulation, the spermatozoa penetrate the corona radiata until the sperm attaches to the zona pellucida. When the spermatozoa successfully penetrate the zona pellucida, oocyte fusion will occur. Haploid sperm cell to fertilize the haploid egg. The union of the ovum and spermatozoa triggers the start of mitotic division which will produce up to 32 cells called morula which will develop into a blastocyst.
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many people believe that taking zinc lozenges reduces the severity and duration of the common cold. sebastien decides to conduct a study at his school to explore this claim. he sends a survey to a simple random sample of 100 students, asking them to if they took zinc lozenges or not during their last cold, and how long they experienced cold symptoms. he found that students who took zinc had a mean cold duration that was 1.2 days lower than those who did not take zinc. which of the following statements about his study is true?
Sebastien's study is subject to confounding.
What are zinc lozenges?
A well-liked remedy for the common cold is zinc. According to some studies, zinc lozenges may shorten colds' duration by one or two days and may lessen the incidence of upper respiratory infections. Zinc aids in wound healing and infection prevention. Treatment of the common cold with zinc gluconate lozenges, using adequate doses of elemental zinc, may be effective in reducing the duration and severity of cold symptoms. If the lozenges are started as soon as symptoms appear, the benefit seems to be at its greatest. The formulation of the lozenges also appears to be important because the addition of citric acid or tartaric acid may reduce efficacy due to the chelation of zinc ions.
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Which organelles are found in an animal cell?check all that apply. Endoplasmic reticulumcentriolescell wallvacuoleslysosomesmitochondriachloroplastscell membrane.
The organelles present in an animal cell are-endoplasmic reticulum, centrioles, vacuoles, lysosomes, mitochondria, and cell membrane.
The endoplasmic reticulum is continuous with the outer nuclear membrane. It facilitates the production of chemical compounds as well as their transport into and out of the nucleus.
During meiosis and mitosis, centrioles are crucial to cell division.
Vacuoles play a key role in the storage of waste materials and aid in regulating the pH of the cell.
The waste molecules are broken down into simpler substances by lysosomes.
The mitochondria are the powerhouse of the cell because they contribute to the production of ATP, which the cell uses as energy for a variety of tasks.
The cell's protective barrier is the cell membrane. It controls how things get into and out of the cell.
The complete question is:
Which organelles are found in an animal cell? check all that apply.
(A). Endoplasmic reticulum
(B). Centrioles
(C). Cell wall
(D). Vacuoles
(E). Lysosomes
(F). Mitochondrial
(G). Chloroplasts
(H). Cell membrane
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Which is not true about all
of these elements?
Answer:
A. They are all in the same group B. They all have the same number of valence electrons C. They all have the same number of protons D. They all share similar properties
Explanation:
the theory of endosymbiosis and history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other plant species bacterial species other tree species
The theory of endosymbiosis and the history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other bacterial species (Option II).
What is the theory of endosymbiosis?The theory of endosymbiosis is a model to explain the origin of eukaryotic cells, which postulates that these types of organisms evolved as a consequence of symbiotic relationships between primitive bacterial cells that converted into mitochondria and chloroplasts in animals and plants.
Therefore, with this data, we can see that the theory of endosymbiosis is based on the scientific idea that eukaryotic cells as observed in plants and animals generated due to symbiosis with primitive bacterial cells that entered into the cell and performed cellular respiration and photosynthesis.
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What would happen to a cell that didn’t replicate its dna before cell division?
The cell will not proceed with the further processes.
What is equational division?
Chromosome replication and equal distribution between the two daughter cells occur during the cell division process known as mitosis. Each daughter cell has the same number of chromosomes as the parent cell, making them diploid. Thus, mitosis is also referred to as equational division.
Unequal division will result if the cell didn't replicate prior to actually cell division. As a result of the checkpoints, it won't move on to the next step. The checkpoint will later start the apoptosis process, which results in programmed cell death.
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Maltase is an enzyme that is not able to catalyze the synthesis of lipids because maltase.
Due to its unique active site, the enzyme maltase is unable to catalyze the production of lipids. One enzyme that particularly reacts with maltose is called maltosease (a sugar molecule). Because maltase has a unique active site, it is an enzyme that cannot catalyze the creation of lipids.
The biological molecules known as enzymes serve as catalysts in living things. They have a proteinoid makeup. The following characteristics of enzymes are listed The processes that enzymes catalyze do not affect them in any way. Enzymes work on particular substrates because they are substrate-specific. pH and temperature catalyze affect how well enzymes work.
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Covalent modification generally turns off genes by attracting proteins that bind to methylated cytosines and block gene transcription.
a) DNA Methylation
b) miRNA
c) RNAi
d) tRNA
The correct option among the following was DNA Methylation.
define DNA Methylation ?
A biological process called DNA methylation involves the addition of methyl groups to the DNA molecule. Without altering the sequence, methylation can modify the activity of a DNA region. DNA methylation often suppresses gene transcription when it occurs at a gene promoter. DNA methylation plays an important role in a variety of critical processes in mammals, including ageing, cancer, X-chromosome inactivation, genomic imprinting, and transposable element suppression.
Adenine and cytosine are the two nucleobases on which natural, enzymatic DNA methylation occurs as of 2016. N6-methyladenine[1], 5-methylcytosine[2], and N4-methylcytosine are the modified bases. [3]
The DNA nucleotide cytosine is methylated to create 5-methylcytosine at position 5 on the pyrimidine ring. This is the same place that separates thymine from the homologous RNA base uracil, which has no methyl group. 5-Methylcytosine undergoes spontaneous deamination and is changed into thymine. A T:G mismatch emerges from this. If A is substituted for G, the original C:G pair becomes a T:A pair, thus altering a base and producing a mutation. Repair mechanisms then fix it back to the original C:G pair.
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outline the process of transcription in the nucleus including the
Initiation, elongation, and termination are the three steps of transcription that are depicted here. Initiation, elongation, and termination are the three stages of transcription.
What are the four steps in the transcription process?The process of copying DNA to create a complementary strand of RNA is called transcription. After that, RNA is translated to become proteins. Initiation, promoter removal, elongation, and termination are the four main phases of transcription.
In what transcription does the nucleus engage?Transcription takes place in the cell's nucleus since the genes are bound there, but the mRNA transcript needs to be delivered to the cytoplasm. In prokaryotes, which include bacteria and archaea, transcription takes place in the cytoplasm of the cell since these organisms lack organelles and membrane-bound nuclei.
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which bones unite to form the highlighted bone?
The highlighted bone is named the sternum. The sternum, which lies in the middle of the chest, is where the ribs connect to the body.
Which joint does the humerus's highlighted bone form?The humeral head's ball and glenoid's socket connect at the glenohumeral joint. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles' tendons make up the rotator cuff, which joins the humerus to the scapula. Muscle and bone are joined via tendon.
What develops in the indicated curvature?When a child is able to sit up on their own, the lumbar curvature that is highlighted begins to develop. The structure in bold allows for head lateral rotation. The structure in bold allows for head lateral rotation.
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Answer and match them
Answer:
Answered (?)
Explanation:
1. C
2. E (?)
3. F
4. D
5. B
6. A
I wasn't sure about E because for me I would say that means 'extinction' but that's not an answer, I tried my best and hope this helps!
Which of the following statements are true about an IV set up? a. Line markings indicate how much fluid has infused into the patient. b. The injection port provides needle-less entry into the IV tubing. c. The IV bag includes information about the type and volume of IV solution d. The slide clamp compresses the tubing to allow IV flow rate to be increased or decreased e. The line markings on all primary IV bags start with a "0"
The correct statements about the IV set are:
Line markings indicate how much fluid has been infused into the patientThe IV bag includes information about the type and volume of the IV solutionThe line markings on all primary IV bags start with a "0".What is an infusion set?
It is the fastest mode of transfer of fluids throughout the body from a sterile glass. It is not used in the transfer of blood and blood-related products.
Features of IV set:
Sharp spike for easy piercing with an antibacterial snap capSmooth roller clamp for regulating the flow rateThe Latex-free bulb at the distal end for intermittent medicationApproximately 20 drops/ml. Kink-resistant PVC tubingRotating lulerlockVented, Non-Vented and Micro-dripDEHP free materialHence, options a, c, and e are the correct statements
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The correct statements about the IV set are: option a, c and e.
Line markings indicate how much fluid has been infused into the patientThe IV bag includes information about the type and volume of the IV solutionThe line markings on all primary IV bags start with a "0".What is an infusion set?It is the fastest mode of transfer of fluids throughout the body from a sterile glass. It is not used in the transfer of blood and blood-related products.
Features of IV set:
Sharp spike for easy piercing with an antibacterial snap capSmooth roller clamp for regulating the flow rateThe Latex-free bulb at the distal end for intermittent medicationApproximately 20 drops/ml.Kink-resistant PVC tubingRotating lulerlockVented, Non-Vented and Micro-dripDEHP free materialHence, options a, c, and e are the correct statements
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Cells that have absorbed melanin to distribute pigmentation to other cells are located in what layer of the skin?.
Answer:
k
Explanation:
During the cell cycle, the cell divides its nucleus and chromosomes during. The cytoplasm and cell membrane divide during. Before the cell can divide again, it must grow and synthesize proteins during the phase and duplicate its chromosomes during the phase.
During the mitotic (M) phase, the cell divides its copied DNA and cytoplasm to make two new cells. M phase involves two distinct division-related processes: mitosis and cytokinesis.
The fluidy substance that fills a cell's inside is called cytoplasm. Salts, water, and numerous organic compounds make up its composition. Membranes surround some intracellular organelles, such as the nucleus and mitochondria, and keep them from coming into contact with the cytoplasm. One cell (the mother) splits into two genetically identical new cells (the daughters) during the process of mitosis, a kind of cell division. In the context of the cell cycle, mitosis refers to the stage of cell division during which the DNA in the nucleus of the cell is divided into two identical sets of chromosomes.
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The hydrogen ions released by the dissociation of carbonic acid are buffered by their A) transport into the erythrocyte as sodium ions move out. B) transport out of the erythrocyte as a sodium ion moves in. C) active transport out of the erythrocyte. D) binding to DNA within the nucleus. E) binding to hemoglobin.
The hydrogen ions released by the dissociation of carbonic acid are buffered by their transport into the erythrocyte as sodium ions move out option A is correct.
what are hydrogen ions?
A hydrogen ion is a positively charged molecule as a result of it loosing an electron. Which is also the nucleus of a hydrogen atom separated from its accompanying electron.
what is erythrocyte ?
literally it is referred to as Red blood cell, red blood corpuscles, haematids, erythroid cells etc. This is also type of blood cell that is made in the bone marrow and found in the blood. Erythrocytes contain a protein
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electrons excited in photosystem ii help the chloroplast produce
As excited electrons move through the electron transport chain, NADPH is created.
The photosystem II's source of the excited electrons is what?A chlorophyll molecule's excited electron is moved to the an electron acceptor at the reaction center.It's an oxidation-reduction reaction right now.An electron from water is used in photosystem II to replace the electron lost from the reaction center.
What is produced during photosynthesis by photosystem 2?In oxygenic photosynthetic organisms, photosystem II is the first membrane protein complex.It uses light energy to catalyze the oxidation of water, which results in the production of atmospheric oxygen.
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place each choice in its correct position on the typical multipolar neuron in the figure. place the anatomical names of neuron structures above the neuron. place the events that occur at the bracketed locations below the neuron.
Multipolar neurons are neurons from the central nervous system. They are composed of an ovoid cell body with several dendrites emerging from it, a long axon, and axon terminals. Graded potential occurs in the neuronal soma, while action potential occurs in the axon.
What is a multipolar neuron?
Neurons are formed in general by
A cellular body, soma,Dendrites, which are cytoplasmic extensions that receive stimuli from other cells, and An axon, which is a long formation capable of conducting the electrochemical signals.
Multipolar neurons are the ones that have a single axon and several dendrites.
Dendrites emerge from an ovoidal soma, and extend in different directions, creating a net and increasing the neuronal area to receive stimuli.
Axons are very large and covered by Schwann cells, facilitating impulse transmission.
These neurons are usually located in the central nervous system and integrate information coming from other nerve cells.
Every neuron forms connections with other neurons. These connections are known as synapsis.
As it happens in every synapsis between neurons when a presynaptic neuron sends information, a neurotransmitter is released.
Neurotransmitters are chemical substances that travel through the synaptic cleft to the junctional area of the other neuron and bind to its receptors in the postsynaptic membrane.
This binding produces a depolarization of the cell called an excitatory postsynaptic potential.
Graded potential initiates in the soma and dendrites.An action potential is initiated in the axon and spreads to the rest of the membrane depolarizing it.
In the image,
Anatomical names from the left to the right: dendrite, body cell, initial segment of the axon, axon, axon terminals.Events from the left to the right: graded potential, action potential.You can learn more about multipolar neurons at
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Part a. A plate inoculated with a sample volume of 10^-7 mL produced 170 colonies. What was the original concentration in the sample? Show work.Part b. After incubation, how many colonies should be on the 10^-8 mL plate from the dilution series in Part a? Show work.Part c. After incubation, how many colonies should be on the 10^-6 mL plate from the dilution series in Part a? Show work.
the serial dilution, solution for the original concentration in the sample is 170 colonies, solutions are A-10^-7 mL=1.7 x 10^9 cfu/mL
After incubation, 10^-8 mL x 1.7 x 10^9 cfu/mL= 17 colonies should be on the 10^-8 mL plate from the dilution series in Part a , c-10^-6 mL x 1.7 x 10^9 cfu/mL= 1700 colonies. Serial dilutions are created by repeating the same dilution step, with the previous dilution serving as the input to the next dilution in each step. The dilutions are a geometric series because the dilution-fold is the same in each step (constant ratio between any adjacent dilutions). A small amount of a well-mixed solution is transferred into a new container, and more water or other solvent * is added to dilute the original solution. The diluted sample is then used as the base solution for further dilution.
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three babies were recently mixed up in a hospital. based on the data in the table above, the couple with blood types a and b are the actual parents of the child with blood type
Based on the data of blood types for both the couple and the babies, baby #3 with blood type AB belongs to Couple II with blood type A and B.
Why is Blood type important?Certain antigens are substances that can trigger an immune response that are considered foreign to the body. These antigens are found in blood types that determines its presence or absence.
In order for medical situations such as blood transfusion to successfully occur, blood type matching is needed. Blood type plays other important roles in genetics that include matching to identify parentage as is the case of the question where the baby with AB can only come from the parents with A and B blood type.
The full question is:
Three babies were mixed at the hospital. Given the data below, the couple with blood types a and b are the actual parents of the child with blood type?
COUPLE # I II IIIBlood type A&A A&B B&OBABY # 1 2 3Blood type B O ABLearn more on blood type here: https://brainly.com/question/15289194
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in a study of the forces involved when motor proteins
Motor proteins also produce force locally within the network of cytoskeletal polymers, which transmits these forces to determine the shape of each cell and, ultimately, the architecture of tissues and whole organisms. Chapters 37 to 39 and 44 illustrate how motors move cells and their parts.
_____ provides employees with specific, identifiable knowledge and skills for use in their present jobs. a. Development b. Recruiting c. Networking d. Training
Answer:
D
Explanation:
Give the number of protons electrons and neutrons in neutral atoms of each of the following isotopes.
Each of the above isotopes has, in turn, the following numbers of protons, electrons, and neutrons:
a) : 5,5,5\s
b) : 80,80,119
c) : 29,29,34
d) : 6,6,7\s
e) : 34,34,43
It is referred to be an element if all of its atoms have a distinct number of neutrons despite having the same amount of protons.
Atomic number = amount of protons x number of electrons
Mass number minus proton count equals the amount of neutrons.
Number of protons, electrons, and neutrons calculation.
(a) Nuclear number is 5.
There are 5 protons.
There are five electrons.
Atomic weight is 10
Atomic number - proton count equals the amount of neutrons.
Neutron count is equal to 10 – 5 = 5.
(b) Atomic weight is 80.
80 is the proton count.
Electron count is 80.
Atomic weight is 199.
Atomic number - proton count equals the amount of neutrons.
Neutron count is equal to 199 − 80 = 119.
(c) Nuclear number is 29.
There are 29 protons.
There are 29 electrons.
Atomic weight: 63
the quantity of neutron.
(Give the number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes:
(a) 10,5 B
(b) 199,80 Hg
(c) 63,29 Cu
(d) 13,6 C
(e) 77,34 Se)
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Drag each label into the appropriate position to identify whether the statement depicts something true or false about the specimen pictured below: - contains connective tissues- visible directional orientation of collagen fibers- found in areas where bones are joined via cartilage- same tissue category as blood- a larger portion of extracellular matrix to cells- functions to resist shock; - seen in tendons
- contains dense irregular connective tissue
- contains a perichondrium
- chondrocytes in clusters of 3-4 arranged in clumps
TRUE Statement
- contains connective tissues
- visible directional orientation of collagen fibers
- found in areas where bones are joined via cartilage
- same tissue category as blood
- a larger portion of extracellular matrix to cells
- functions to resist shock
FALSE Statement
- seen in tendons
- contains dense irregular connective tissue
- contains a perichondrium
- chondrocytes in clusters of 3-4 arranged in clumps
What is perichondrium?
The cartilage of growing bones is surrounded by a layer of dense, wavy connective tissue called the perichondrium. It is made up of an inner chondrogenic layer and an exterior fibrous layer. Fibroblasts in the fibrous layer create collagenous fibers. The chondrogenic layer can produce chondroblasts and is yet undifferentiated. Both hyaline cartilage and elastic cartilage have perichondrium at their edges.
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arginase, a key enzyme in liver urea production, requires four ____ atoms per molecule. group of answer choices iron copper zinc manganese
Ceruloplasmin is one illustration; it has eight copper atoms per molecule. Copper and zinc provide as examples of the needs for and toxicity of important trace elements.
What trace mineral is necessary for gluconeogenesis' primary enzyme to be activated?Manganese is a trace mineral that functions as a cofactor for enzymes that produce urea, cholesterol, and glucose (gluconeogenesis) (amino-acid catabolism in the liver).
Which Micromineral is deemed crucial for healthy brain function?The liver, kidney, pancreas, and bones are where manganese is primarily deposited. and contributes to the regulation of blood sugar, calcium absorption, and fat and carbohydrate metabolism. For healthy nerve and brain function, manganese is also essential.
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