Answer:
28 × 10⁶ colonies/ml
Explanation:
Let C be the concentration of bacterial in the initial stock. When it is diluted by a factor of 10⁶, the new concentration is C' = C/10⁶.
When 2 ml of this concentration is spread on a Petri dish of solidified media, 56 colonies were produced. The number of colonies, n after spreading the 2 ml of C' is C' × 2 ml = 2C' = 2C/10⁶.
So, n = 2C/10⁶.
Since the number of colonies after spreading on a Petri dish of solidified media is 56, n = 56 colonies.
So, 2C/10⁶ = 56
Making C subject of the formula, we have
C = 56 × 10⁶/2
C = 28 × 10⁶ colonies/ml
So, the initial concentration of bacteria is 28 × 10⁶ colonies/ml
Match the organelle (1-4) with the correct description (5-8). 1) mitochondrion 5) synthesizing molecules 2) centriole 6) liquid in cell 3) endoplasmic reticulum 7) provides cell with energy 4) cytosol 8) aids the formation of the spindle apparatusA) 1 and 5, 2 and 6, 3 and 7, 4 and 8 B) 1 and 7, 2 and 6, 3 and 8, 4 and 5 C) 1 and 7, 2 and 8, 3 and 5, 4 and 6 D) 1 and 8,2 and 5, 3 and 6, 4 and7 E) 1 and 6, 2 and 8, 3 and 5, 4 and7
Answer:
C) 1 and 7, 2 and 8, 3 and 5, 4 and 6
Explanation:
1 and 7: 1) mitochondrion; 7) provides the cell with energyThe mitochondrion is the organelle that produces the energy that the cell needs for its functions. It synthesizes adenosine triphosphate (ATP), which storages large quantities of energy in its bonds.
2 and 8: 2) centriole; 8) aids the formation of the spindle apparatusThe centrioles have a crucial role during mitosis. They form the spindle apparatus that attaches to the chromosomes, moving them to the opposite poles of the cell.
3 and 5: 3) endoplasmic reticulum; 5) synthesizing moleculesThe endoplasmatic reticulum is a continuous membrane connected to the nuclear membrane. There are two types, the Rough Endoplasmatic Reticulum (RER) and the Smooth Endoplasmatic Reticulum (SER). The first one synthesizes proteins, while the second one synthesizes lipids.
4 and 6: 4) cytosol; 6) liquid in the cellThe cytosol is the liquid that is inside the cell. It is mostly water, but it also has ions and molecules. It is important for the transport of substances.
The correct match between organelles and their description is - Option C. 1 and 7, 2 and 8, 3 and 5, 4 and 6.
In the cell, there are many organelles that perform different and specific functions essential for the cell to survive. These organelles help in synthesizing molecules, energy production, cell division, and many others.
Mitochondrion: it is a cell organelle that is the site of cellular respiration, which is a process that breaks the sugar molecule and releases a high amount of energy in the form of ATP. Therefore, it is known as the powerhouse of the cell. Thus, correctly matches with 7) provides the cell with energyCentriole: It is organelles that help to form the spindle during the cell division in the cell that makes the region at the poles where spindle fibers form. Thus, it correctly matches with 8) aids the formation of the spindle apparatus.Endoplasmic reticulum: It is organelles that synthesize various molecules such as hormones and other protein molecules, Rough ER has ribosomes attached to it that synthesize proteins. Thus, correctly matches with 5) synthesizing moleculesCytosol: It is a semi-fluid-like substance made up of a lot of water, dissolved ions, smaller minute molecules, and proteins. It has filled in the interior cellular space. Thus, the correctly matches with 6) liquid in the cell.Thus, the correct answer is - Option C.
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g Cerebrospinal fluid formed in the lateral ventricles travels through the ________ to reach the third ventricle.
Answer: Interventricular foramen
Explanation:
The cerebrospinal fluid is a fluid that covers the brain and spinal cord. It circulates through the subarachnoid space, the cerebral ventricles and the ependymal canal. Several diseases alter its composition and its study usually detects meningeal infections, carcinomatosis and hemorrhages. Some of its functions are:
Hydropneumatic support against local pressure for the encephalon.Eliminates metabolites from the central nervous system.Protects the central nervous system from trauma.This fluid also fills the ventricles, which are large open structures deep within the brain and help keep the brain buoyant and cushioned. The lateral ventricles are the largest ventricles and connect to the third ventricle through the intraventricular foramen. This third ventricle is a narrow, medial cavity located between the diencephalic masses. Then, the interventricular foramina are channels that connect with the ventricles of the lateral walls and with the third ventricle, at the level of the midline of the brain. Like these channels, they allow cerebrospinal fluid to circulate through the rest of the ventricular system of the brain. The walls of the foramina also contain choroid plexuses, responsible for the production of cerebrospinal fluid, which continue in both the lateral ventricles and the third ventricle. After reaching the third ventricle, the cerebrospinal fluid travels through the median aperture into the subarachnoid space at the base of the brain.
Dalits are followed enters in temples true or false
Answer:
False A notice by the priest told dalits they can’t enter the temple because they are “not pure”
Hemophilia is inherited in humans as an X-linked recessive condition. A phenotypically normal woman whose father was hemophiliac marries a normal man. What is expected among their offspring?
Answer:
100% of the girls are expected to be normal, X+X+ and X+X-50% of the boys are expected to be normal, X+Y50% of the boys are expected to be hemophilic, X-Y75% of the whole offspring normal (X+X+, X+X-, X+Y)25% of the whole offspring hemophilic (X-Y)Explanation:
Due to technical problems, you will find the complete explanation in the attached files
Briefly describe the main hormonal and physiological events of each of the following:the uterine cycle
Answer:
Menstruation, the follicular phase, ovulation and the luteal phase.
Explanation:
Menstruation, the follicular phase, ovulation and the luteal phase are the four events or phases of the menstrual cycle. Luteinizing hormone, follicle-stimulating hormone, and the female sex hormones i.e. estrogen and progesterone are the types of hormones that controls the uterine cycle. Each event in the uterine cycle has its own significance in the female body.
Which of the following hormones is directly
controlled by nervous system?
A. Adrenaline
B. Estrogen
C. Thyroxine
D. Cortisol
Answer:
adrenaline is the hormone which is directly controlled by nervous system
Sigmoidal plots of activity versus substrate concentration are exhibited by a. holoenzymes. b. Michaelis-Menten enzymes. c. allosteric enzymes. d. monomeric enzymes. e. isozymes.
Answer:
The correct answer is C
Explanation:
Allosteric enzyme is an enzyme that has more than one active site on the surface of the enzyme. Generally, the binding to one of these active sites affects the affinity of the other active sites on the enzyme; this causes the enzyme not to follow the Michaelis-Menten's enzyme kinetics. Thus, when the activity versus substrate is plotted on a graph, a sigmoidal curve shown instead of an hyperbolic curve (like other enzymes).
Which is NOT true of smooth muscle? A. They use peristalsis to move substances through tubes. B. They are found in the hollow parts of the body such as blood vessels and the small intestine. C. They can become fatigued. D. They are connected by gap junctions.
Answer: the answer is C
Explanation: I been trying to find the same answer for this exact question for acellus and C was the correct answer
Which area appears only on the posterior part of the body? a)scapular b)patellar c)umbilical d)sternal
Answer:
Patellar
Explanation:
Answer:patellar
Explanation:
On the posterior side
Sets the metabolic rate for the cells of the body describes
Answer:
BMR ; Basal Metabolic Rate
Explanation:
MR is the rate of energy expenditure per unit time by endothermic animals at rest....
Metabolic comprises the process that the body needs to function.
Basal metabolic rate is the amount of energy per unit of timethat a person needs to keep the body functioning at rest
White petal color is a recessive trait.
Answer:
An example of a dominant trait is the violet-colored flower trait. For this same characteristic (flower color), white-colored flowers are a recessive trait.
Explanation:
the impact of grassroots challenges to trash incinerators
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Answer:
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Which two physical properties of graphite make it a good mineral for use in pencils?
1. luster and fracture
2. cleavage and color
3. hardness and streak
4. greasy feel and composition
The physical properties of graphite which makes it good for pencils is ;
( 3 ) hardness and streak
Graphite is made up of carbon atoms which are held together by van der waals forces ( weak force ). They are soft and slippery which is why graphite is used in the manufacture of lubricants. while graphites are used for the manufacture of writing materials such as pencils because of its hardness and streak
Hence we can conclude that the physical properties of graphite which makes graphite good for the production of pencils are hardness and streak
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write the function of eustachian tube?
Answer:
Equalized air pressure.
Explanation:
The function of eustachian tube enables air pressure to be equalized between the outside air and the middle ear cavity. The eustachian tube also known as pharyngotympanic tube that connects the middle ear cavity with the nasopharynx. Eustachian tube is responsible for the aeration of the middle ear system as well as clears mucus from the middle ear into the nasopharynx. Opening and closing functions of the eustachian tube are is very important.
What is physiological?
Albinism is a recessive trait where an individual does not produce the pigment melanin. A man and woman who both produce melanin have one child out of three who has albinism. What are the genotypes of the man and woman
Albinism is a recessive trait where an individual does not produce the pigment melanin. Albinism is an autosomal disease where the gene which is expressed here is having albinism which is the cause of heterozygous condition.
What is the heterozygous ?
Heterozygous is the condition where the genes in the alleles are different to each other where one has a dominant character and one has a recessive character. The genotypes of the woman and man decide the genotype of the offspring.
The genotypes of the man and woman is heterozygous where the dominant once out of 3 will have the dominant traits for the albinism. The condition will have to be heterozygous as in the Ia Ii gene where the gene for the albinism will be i gene.
The same genotype for the male where the Ib i gene in which i i the albinism carrying gene here the ii condition of the gene will express the albinism.
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The eurkaryotic cells glycocalyx is..?
Explanation:
The glycocalyx is a carbohydrate-enriched coating that covers the outside of many eukaryotic cells and prokaryotic cells, particularly bacteria .
What is the closest crop relative of Aloe vera?
Answer:
lily
Explanation:
Part B
Next, our galaxy can be organized into a galaxy group. This galactic group is a collection of about 50 galaxies that are
gravitationally bound to each other. What is the name of the galaxy group in which our galaxy belongs? As you are
researching, list at least three characteristics that you learned about our galaxy group.
Answer:
The Milky Way galaxy is part of a group of galaxies called the Local Group. Three characteristics that I learned about our galaxy group is The Milky Way is a large barred spiral galaxy, they come in a variety of shapes and sizes, and it appears as a milky band of light in the sky when you see it in a really dark area.
Explanation:
Edmentum
The Milky Way galaxy is a member of the Local Group of galaxies named Laniakea . The Milky Way is a massive barred spiral galaxy and can be seen as a milky band of light.
What are the characteristic feature of the Milky Way?
The Milky Way galaxy is a massive, flat, disk-shaped collection of stars, gas, and dust that spans around 100,000 light-years and is several thousand light-years thick.
The Milky Way galaxy contains every star that we can see with our unaided eyes. The Andromeda Galaxy is the only celestial object visible in the night sky with unaided eyes that is not part of the Milky Way.
It is estimated that the Milky Way is 12 billion years old.
Thus, Milky Way is the galaxy we live in amongst others.
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__________________ moves the respiratory medium over the respiratory surface.
Group of answer choices
perfusion
percolation
ventilation
diffusion
Answer:
ventilation
Explanation:
Breathing, also known as ventilation, is the process of moving air or water in order to facilitate the gas exchange between the external and internal (body) environment, mostly to eliminate carbon dioxide (CO2) and bring in oxygen (O2). For example, fish are aquatic animals that need to run water over their gills to get the O2 that they need to survive (gills are organs that create a large surface area for ventilation). Moreover, insects ventilate their tracheal system to get O2. Finally, terrestrial vertebrates (i.e., amphibians, reptiles, birds, and mammals) use organs called lungs to exchange O2 and CO2 between their cells and the external environment.
Describe how oxygen is transported in blood, and explain how temperature, pH, BPG, and affect oxygen loading and unloading.
Solution :
The flow of oxygen in the blood is been transported by two ways :
1. in plasma 1.5%
2. bound to hemoglobin 98.5%
As the oxygen loads in the body, affinity of the Hb makes the oxygen loading very efficient in the blood. The Hb molecule gets saturated when all the 4 hemes are oxygen binded.
The decreased pH weakens the hemoglobin oxygen binding in the tissues.
Higher temperatures in the oxygen means a lower affinity and thus more oxygen is released and so the oxygen unloads.
Increase in the temperature, the BPG and the modification of the structure in the hemoglobin decreases the affinity for the oxygen and further enhances the unloading of the oxygen in the blood.
nucleotides are the basic
unit for which macro molocules
The correct answer to question is Nucleic Acids, (DNA) AND (RNA).
hope this helps let me know.
"During cytokinesis of an animal cell, a cell plate grows from the center moves outward"
True
False
Answer:
True
Explanation:
What is the role of DNA polymerase enzymes in replication?
(A) unzipping the double helix by breaking down the hydrogen bonds
(B) adding the free nucleotides to the complementary strand of DNA
(C) splitting the DNA molecule
(D)connecting the fragments on the lagging strand of DNA
Answer:
A
Explanation:
the function of DNA polymerase is to unzip the double helix structure of DNA by breaking down the weak hydrogen bond
Answer:
(B) adding the free nucleotides to the complementary strand of DNA
Explanation:
A DNA polymerase is an enzyme capable of creating new DNA molecules by sequentially adding nucleotides to the three prime (3')-end of a DNA strand. A DNA strand is a polynucleotide chain composed of a linear series of nucleotides, each consisting of a deoxyribose sugar, and phosphate, and a base (i.e., thymine, guanine, cytosine and adenine). Before a cell starts to divide, it needs first to replicate its genetic material by using DNA polymerases that duplicate the cell's DNA during the interphase (S phase). During this process (DNA replication), an enzyme known as helicase unwinds the DNA molecule, which is made up of two antiparallel strands oriented in opposite 3′-5′ directions to each other. Subsequently, each strand is used as a template for its replication through DNA polymerases that can add nucleotides (one at time) to an existing short fragment of RNA, i.e., the primer sequence, which is paired with the template DNA strand.
how does Fibrocartilage receive it's nutrients?
Answer:
These cells receive nutrients through a double diffusion barrier but rely on anaerobic respiration due to low oxygen concentration.
Who was Dr. Joseph Bell?
Answer:
Sherlock Holmes
Explanation:
He was the inspiration. Not the actual Holmes.
Answer:
Joseph Bell (2 December 1837 – 4 October 1911) was a Scottish surgeon and lecturer at the medical school of the University of Edinburgh in the 19th century.
g An Hfr strain is produced when Select one: A. an F episome is transferred to a new cell. B. an F episome leaves the E. coli chromosome. C. an F episome leaves the host chromosome and removes some of the host chromosome. D. an F episome integrates into the E. coli chromosom
Answer:
A. an F episome is transferred to a new cell.
Explanation:
Hfr strains arise from the integration of the plasmid into the bacterial cell in one of several ways such as the recombination of events. Most commonly are formed by the UV-induced integration of E coil F factor. It tries to transfer a copy of the F factors as well the entire chromosome to the recipient bacterium.A suspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. To follow this process by monitoring the release of CO214, at which positions in the glucose molecule would the C14 label need to be incorporated
Answer:
carbons 3 and 4
Explanation:
Alcoholic fermentation is an anaerobic (non-oxygen-requiring) pathway capable of converting one mole of glucose (C6H12O6) into two moles of ethanol (C2H5OH) and two moles of carbon dioxide (CO2), producing during this process two moles of ATP. The overall chemical reaction is as follow: C6H12O6 (glucose) >> 2 C2H5OH (ethanol) + 2 CO2. During this process (fermentation), energy is obtained from the glycolysis process by which each glucose molecule is broken down into two pyruvate molecules (2 CH3COCOO−). Pyruvic acid is an organic acid that ionizes to produce a hydrogen ion and a molecule of pyruvate. Subsequently, this pyruvate is then converted into ethanol and CO2, generating NAD+, i.e., the oxidized form of nicotinamide adenine dinucleotide or NAD, which is required for glycolysis (and therefore to produce ATP). Moreover, dismutation refers to the redox reaction by which one compound with an intermediate oxidation state converts into two compounds. In consequence, the CO2 generated during fermentation arises from the dismutation of pyruvic acid. During this process, the major source of CO2 is carbon 3 (C3) and carbon 4 (C4) of the glucose as a result of the dismutation of pyruvate, and thereby these positions in the glucose molecule would the C14 label need to be incorporated.
Hola, necesito ayuda con este ejercicio. Regalo 70 puntos, 5 estrellas y corazón.
Respuesta corta: Produciendo un sentimiento de satisfacción.
Explanation
En el texto se hace referencia a una investigación para analizar la relación entre las redes sociales y el cerebro de los adolescentes. Para ello los investigadores utilizaron imágenes magnéticas del cerebros de los 32 adolescentes estudiados. Una vez terminaron el estudio se dan cuenta que "una estructura del cerebro, llamada núcleo accumbens, se activa más cuantos más likes tuviera una imagen". Además, el autor del texto agrega que "Esto es interesante si se tiene en cuenta que este órgano nervioso es el responsable de que experimentemos momentos de placer intensos al ganar un premio, comer helado, etc". De acuerdo a lo anterior se puede interpretar que las redes sociales influyen en el cerebro de los adolescentes debido a que produce en ellos un sentimiento de satisfacción o reconocimiento a recibir "likes" de otras personas. Además, este sentimiento se puede interpretar como aprobación por parte de las demás personas.
