Answer:
UCS=US=unconditioned stimulus. UCR=UR=unconditioned response. CS=conditioned stimulus. CR=conditioned response. NS=neutral stimulus.
Why might an individual with AIDS have difficulty fighting off otherwise harmless infections? please answer!! last question I have!!!
Answer:
The HIV virus that causes AIDS kills T-cells. T-cells are responsible for fighting off infections. So someone with AIDS has a reduced number of T-cells and are unable to fight off infections that are harmless to other individuals.
g You have made a transgene that expresses green fluorescent protein (GFP) in spermatogonia only. If you are examining a transverse section of the testes where would you expect to find GFP positive (GFP) cells
Answer:
The correct answer is - Associated with the Sertoli cells in the seminiferous tubule.
Explanation:
Interstitial cells are found between seminiferous tubules and Each spermatogonial cell undergoes the process of spermatogenesis process and produces sperms in the lumen of seminiferous tubules.
This could be possible only due to GFP gene expresses only in spermatogonia, we can expect to find GFP + cells associated with the Sertoli cells in the seminiferous tubules.
Therefore, Spermatogonia are associated with Sertoli cells in the seminiferous tubules of the testis.
A. the influence of environment on the expression of a particular genotype. B. the expression of a dominant phenotype in a heterozygote. C. the expression of one gene masking the effects of another gene. D. quantitative traits that diminish or intensify a particular phenotype. E. the increased expression of a particular trait when a hybrid species is formed.
The question is incomplete, the complete question is;
Penetrance and expressivity are related to
A. the expression of a dominant phenotype in a heterozygote.
B. the increased expression of a particular trait when a hybrid species is formed.
C. the expression of one gene masking the effects of another gene.
D. quantitative traits that diminish or intensify a particular phenotype.
E. the influence of environment on the expression of a particular genotype.
Answer:
the influence of environment on the expression of a particular genotype.
Explanation:
In genetics, we define penetrance as the proportion of individuals in a given population carrying a particular gene/allele which leads to the expression of the particular trait associated with that gene/allele.
Expressivity is defined as the degree of expression of a given phenotype by individuals who possess a particular genotype. Expressivity shows the extent of variation in expression of genes by individuals having a particular genotype.
Both penetrance and expressivity has to do with the influence of environment on the expression of a particular genotype.
What is the name of a type of nucleic acid that is used for signalling in cells
Answer:ribonucleic acid
Explanation:
- Roots are the only organs in a plant that need water.?
Answer:
No
Explanation:
But they are the only part of plants that absorb water
No roots are not the only organs in a plant that needs water.
What are roots of plant?
Roots are organs of higher plants that absorbs water and mineral ions from soil. Two main type of root system is observed in plants: Tap root system and Fibrous root system. Tap root systems are found in dicotyledonous angiosperms (such as pea) and gymnosperms (such as pine) whereas Fibrous root system is mostly observed monocotyledonous angiosperms (such as wheat or rice).
The three main primary function of the roots are:
1. They anchor the plant to the soil.
2. Absorb water and mineral ions from the soil to be later used by the plant.
3. It acts as food reserve.
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1.Explain how is small intestine designed to absorb digested food.
2.Write two differences between the nutrition in amoeba and human beings.
3.Fungus can be harmful and useful. Give an example showing both of these traits of fungus.
Answer:
Similarity:
Amoeba and human beings require the same nutrients like carbohydrates, proteins, and fats for their growth and survival.
Difference:
1. Mode of Nutrition:
Amoeba is unicellular and microscopic, which makes it an organism that uses the Holozoic mode of nutrition. It ingests food through its cell membrane and feeds on other tiny organisms like bacteria, algae, and protozoans. On the other hand, human beings are multicellular organisms and use saprophytic and holozoic modes of nutrition. They ingest complex food materials that are broken down into simpler nutrients.
Science Practice: Predict______ and__________ based on a given set of data.
Answer:
subject
Explanation:
try only
A team of researchers is investigating a new carbon-rich molecule important to life. They find evidence for the
presence of a carbon-carbon double bond in the molecule. This observation means that the new molecule likely
exists as which of following?
A. an aliphatic hydrocarbon
B. a hydrocarbon ring
C. both cis and trans isomers
Answer:
i think they found a hydrocarbon ring
the chicken first or the egg first?
Answer:
The egg
Explanation:
When aquatic creatures evolved to walk on land, they laid eggs. One of those eggs became a chicken.
Answer:
Egg
Explanation:
According to science chicken because fusion take place first
What process creates new cells?
A. cell division
B. cell metamorphosis
C. cellokinesis
Answer:
A. cell division
Explanation:
What happens inside the mitochondria?
A. photosynthesis
B. blood circulation
C. cellular respiration
Which mineral is produced when two atoms of iron chemically combine with three atoms of
oxygen?
1. garnet
2. pyrite
3. magnetite
4. hematite
The natural mineral form of iron oxide is called hematite The mineral, which contains 70% pure Fe, ranges in color from metallic dull to vivid black to steel-gray. Thus, option D is correct.
What atoms of iron, chemically three atoms of oxygen?Oxides of many significant metals are common. Iron oxides include hematite (Fe2O3), which has a ratio of two iron atoms to three oxygen atoms, and magnetite, which has a ratio of three iron atoms to four oxygen atoms. The most magnetic mineral is magnetite.
On the surface of the Earth, it is the mineral that is most common. There are numerous other applications for hematite.
It is employed in the production of pigments, polishing, heavy media separation, jewelry making, and home energization. In addition to these, it has therapeutic properties.
Therefore, hematite mineral is produced when two atoms of iron chemically combine with three atoms of oxygen.
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After an accident, David has trouble moving his left arm and feeling things with his left fingers. The doctor tells him this is due to brain damage in his cerebral cortex. in which hemisphere is davids brain damage likely to be
One of the distinguishing characteristics of nervous tissue is how difficult it is to repair damage to nervous tissue. Explain factors limit neurogenesis in the CNS of adults, why is it so hard to repair a damaged nerve
Answer:
Inhibitory influences from neuroglia, and the absence of growth-stimulating cues.
Explanation:
Neurogenesis in adults is limited by Inhibitory influences from neuroglia, mainly from oligodendrocytes, and the absence of growth-stimulating cues that are present during fetal development. It is so hard to repair a damaged nerve because nerve cell like other cells can't divide and increase in number, they can't renew themselves. Due to no division, the nerve cells does not increase in number and therefore can't repair themselves.
Fossils of a species of bear are found in layer 5. Which layer is most likely to have organisms that lived at the same time as the bear species? O A. Layer 1 B. Layer 2 C. Layer 4 D. Layer 8
The correct answer is C. Layer 4.
Explanation
The image shows 13 layers of rocks on the earth's surface that, according to their age, are located from the oldest below to the most recents up. According to the above, if a fossil of a species of bear is in layer number 5, organisms that lived at the same time could be found in number 4 because it is the closest layer to the layer in which the bear species is mostly found and therefore, the layer that was formed at the same time or right before layer 5. According to the above, the correct answer is C.
Which of these methods that aids in the movement of ions or molecules across a cell membrane requires the use of energy which is supplied by ATP molecules?A. Osmosis.B. Reverse diffusion.C. Passive transport.D. Active transport.E. Facilitated diffusion.
Answer:
D. Active transport.
Explanation:
Active transport is the method that uses the ATP's energy to move ions and molecules from one side to the other of the membrane. The elements move from a place of lower concentration to one of a higher concentration. They move against their concentration gradient, which is why they need the energy to do it. There are two types of active transport, primary and secondary.
The primary active transport is ion pumps that hydrolyze ATP using one of the phosphates of the ATP to change the pump's shape and move the elements against their concentration gradient. It uses the ATP's energy directly.
The secondary active transport does not use ATP directly. It uses the electrochemical gradient that the primary transport had created when hydrolyzing ATP to transport the ions and molecules.
Fred loves La Paz, Bolivia so much that he decides to stay there for a couple years. All of the following changes could be considered a compensatory mechanism in response to the chronically decreased oxygen content EXCEPT
a. an increase in amount of circulating red blood cells.
b. an increase in oxygen extraction by perfused cells.
c. an increase in hemoglobin’s affinity for oxygen.
d. a decrease in heart rate.
Answer:
d. a decrease in heart rate.
Explanation:
As the altitude rises, the number of oxygen molecules in the air decreases. Lower oxygen levels at high altitudes stimulate the release of erythropoietin (EPO), which is associated with the increased red blood cells, i.e., it enables more oxygen molecules to be transported to cells and tissues. Moreover, at high latitudes, the increased hemoglobin (Hb)–oxygen affinity helps to safeguard arterial O2 saturation and thus mitigates the effects of low oxygen concentration in arterial blood (arterial hypoxemia). Finally, oxygen extraction depends on an appropriate supply of oxygen in the blood vessels. An increased oxygen extraction occurs when there is an inadequate circulating blood volume or when the number of red blood cells decreases below the normal levels.
explain the structure of human teeth molar
Answer:
Structure of the Tooth
A tooth consists of enamel, dentin, cementum and pulp tissue. The portion of a tooth exposed to the oral cavity is known as the dental crown, and the portion below the dental crown is known as the tooth root.
Which of the following statements is not true of electron microscopes
Explanation:
the electronic microscope is used for observing
planets and stars:-False.
the electronic microscope is used for observing
microorganisms:-True.
The following statement is not true of electron microscopes: "electron microscopes can be used to view living specimens," which is in Option C, as electron microscopes use beams of electrons to produce images, and here living specimens can't be viewed.
What are electron microscopes?Electron microscopes are advanced scientific instruments that use a beam of electrons to produce an image of a specimen, and the use of electrons instead of light in electron microscopy allows for a much higher resolution image, as the shorter wavelength of electrons compared to light means that the images produced by an electron microscope can be much sharper and more detailed.
Hence, the following statement is not true of electron microscopes: "electron microscopes can be used to view living specimens," which is in Option C.
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The question is incomplete, complete question is below
Which of the following statements is not true of electron microscopes
A. Electron microscopes use beams of electrons to produce an image.
B. Electron microscopes have a much higher resolution than light microscopes.
C. Electron microscopes can be used to view living specimens.
D. Electron microscopes can be used to view the internal structure of cells.
What percentage of students were noted as having different values from their parents?
a. 1%
b. 15%
c. 56%
d. 99%
Answer:
c. 56% of students were noted as having different values from their parents
Answer:
56 %Explanation:
The percentage of students were noted as having different values from their parents are 56%.
[tex]hope \: it \: helps[/tex]
Currently, the world population is about
Answer:
approximately 8billion
What is the relationship between types of kinetic chain and whether the origin moves toward the insertion or the insertion moves toward the origin during a muscle contraction?
____________________________________
____________________________________
____________________________________
The Kinetic Chain is an engineering concept used to describe human movement. It is used in a wide variety of clinical condition including musculoskeletal, sports medicine, neuro rehabilitation, prosthetic and orthotics.
The concept of Kinetic Chain was introduced by Franz Reuleaux in 1875. According to him overlapping segments were connected via joints and this created a system where movement ay one joint produced or affected movement at another joint in the kinetic link.
Two types of Kinetic Chain are:
Open Chain:
It is a combination of successively arranged joints in which terminal segment can move freely. Thus the distal segment of the extremity is free to move in space, example- Waving a hand
Characteristics:
- Characterized by a rotary stress pattern at the joint.
- Occur in one primary axis
- The number of simultaneously moving segment is typically limited to one.
- These types of exercises allow for more isolated muscle activation because less muscle co-contraction is used to perform the movement.
Closed Chain:
It is when the distal segment meets considerable external resistance prohibiting free movement. It is a system where neither the proximal nor the distal segment can move.
Characteristics:
- Linear stress pattern produced at the tibiofemoral joint due to axial joint loading.
- Movement at multiple joints and multiple -joint axes at hip, knee, subtalar joints.
- Simultaneous movement occurs at both segment.
What are Insertion and Origin muscles?The insertion and origin muscles are two different places where the bone is attached one at each end. Enthesis is the connective tissue between this attachment.
Insertion Muscles- The insertion muscles are connections to the bone via tendons. It is attached to the more movable bone.
Thus, this muscle is responsible for body movement. It is usually the distal end and has less mass.
Origin Muscles- Origin is the proximal site that stays more stable and relatively fixed during muscle contraction.
The head is a portion at the end of the origin muscle where it fixes to the bone. Some muscles can have more than one head.
Difference between two:
1. Insertion is more movable compared to Origin muscles as the former is attached to bone via tendons whereas the latter is less movable as it is attached via bone.
2. Insertion is a distal end attached to more movable bone whereas origin is proximal end attached to the less movable bone.
3. Insertion has less muscle mass whereas Origin has more muscle mass
4. Insertion moves with muscle contraction whereas Origin doesn't move during Muscle Contraction.
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Describe urine formation
Explanation:
Capillaries of kidneys filter the blood and the essential substances like glucose, amino acids, salts and the required amount of water are reabsorbed. Excess water and nitrogenous waste in humans are converted to urine.hope it helps.stay safe healthy and happy...How did the Physarum polycephalum respond to the oatmeal flakes placed on the agar in the petri dish
Answer:
Like amoeba.
Explanation:
The Physarum polycephalum respond like amoeba to the oatmeal flakes that is placed on the agar in the petri dish because it ingests solid food particles in the same way as an amoeba do and can also absorb dissolved nutrients. Physarum polycephalum feed like amoeba by using its membrane or outer layer surrounding the food particles such as oatmeal flakes and take inside the body for digestion of that food particles.
Como la reducción de impuestos ayuda a la economía
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What is the term for DNA bound to proteins that floats loosely in the nucleus?
chromosomes
ribosomes
nucleolus
chromatin
Answer:
The term for DNA bound to proteins that floats loosely in the nucleus is Chromatin
The term for DNA bound to proteins that floats loosely in the nucleus is chromatin. Thus, option D is correct.
What is DNA?
DNA is defined as deoxyribonuclic acid and it is a polymer made up of two polynucleotide chains that arranged in foiled structure to form a double helical carrying genetic information for the various processes such as growth development functioning and reproduction.
There are four nitrogen bases of DNA nucleotides are such as adenine, thymine, guanine and cytosine. Friedrich Miescher discovered DNA in the year of 1860.
The main function of DNA is to carry information from one generation to another generation this is the reason due to which DNA is also known information molecule.
In our body DNA is found in the nucleus of the cell and it is known as nuclear DNA. The shape of DNA is double helical structure. Siblings share only about 50% of same DNA due to the reason of recombination.The life span of DNA is 521 years.
Therefore, the term for DNA bound to proteins that floats loosely in the nucleus is chromatin. Thus, option D is correct.
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A tall plant has been found, but its zygosity is unknown. Tall is dominant over short height. The following can be done to determine its zygosity: _________.
a. Let it self fertilize then analyze the progeny
b. Cross to a true breeding short plant
c. Cross to a heterozygous tall plant
d. Cross to a true breeding tall plant
Answer:
b. Cross to a true breeding short plant
Explanation:
Prelab Information
Purpose Explore the molecular process of building proteins from the information carried by RNA
using a laboratory procedure.
Time Approximately 45 minutes
Question How are proteins built using the information provided by a molecule of RNA?
Prediction RNA determines the sequence of amino acids in proteins and polypeptides by a two-step process: transcription of DNA produces mRNA in the nucleus, then translation
of the mRNA to tRNA takes place at the ribosome in the cytoplasm.
Answer and Explanation:
Proteins are built using information from RNA, because proteins are made up of amino acids that are arranged in a specific sequence for each protein. This amino acid sequence is determined by RNA, which forms groups of three consecutive nucleotides, which will signal the position that each amino acid must assume to form a protein.
In summary, we can state that the DNA starts the transcription process to create the mRNA, which will have the nucleotides transported by the tRNA from the nucleus to the cell's ribosome, so that there, the nucleotides are organized in a specific sequence, forming amino acids, which will constitute the protein.
All amswers are correct on
Below are several good possible questions. Which one most closely resembles your question?
litterally choose any they all right
How does the increase of algae growth during eutrophication affect the water
Answer:
An excess of supplements fundamentally nitrogen and phosphorus-in water begins a cycle called eutrophication. Green growth feed on the supplements, developing, spreading, and turning the water green. Green growth sprouts can smell unpleasant, block daylight, and even delivery poisons now and again.
hope this helps
2Which term describes the two groups of plants that do not need water to reproduce?
A. spermatophytes
B. cotyledons
C. embryophytes
D. Paleozoic plants
Answer:
A
Explanation:
.............................spermatophytes...........................
