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8_murik_8 [283]
4 years ago
9

Suppose these two chromosomes are found in a cell nucleus during prophase. what is the relationship between chromatids a, b, c,

and d? select all that apply.

Biology
1 answer:
Musya8 [376]4 years ago
3 0
In this image we can see that A is identical to B, and C is identical to D.

Chromatid (Cht) is a DNA molecule (the nucleofilament) associated with histone proteins (PH) and non-histone proteins (PNH)
<span>Each chromosome of a cell may consist of one or two chromatids depending on its state: just after a mitosis, or after the second meiotic division, each chromosome consists of only one chromatid, the rest of the time, after DNA replication, each chromosome consists of two completely identical chromatids, connected by the centromere, thus giving the two rods the shape of an X.</span>

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Describe 3 pieces of evidence that supports human evolution by natural selection.
Nadusha1986 [10]

Answer:

Following are the evidences that support human evolution by natural selection:

i) Biogeography

ii)The fossil record

iii) Molecular Biology

Explanation:

i) Biogeography: it was the geographical distribution of species that was first suggested the idea of evolution to Darwin.

ii) The fossil Record: The succession of fossil forms is strong evidence in a favor of evolution. It provides a visual record in a complete series showing the evolution of an organism.

iii) Molecular biology: Evolutionary relationships among species are reflected in their DNA and proteins, in their genes and gene products.

7 0
3 years ago
Why can a planet orbit circular?
Alla [95]

Answer:

Explanation:A circle is merely a special case of an ellipse. However, the planets do not quite move in ellipses either. The increased kinetic energy of a planet as its distance from the Sun decreases causes it to behave as though it had a greater mass, which results in the point of the orbit furthest from the Sun precessing.

4 0
3 years ago
A geothermal plant has been built in a location. Which of these is the most likely impact of the plant on the location?
Jlenok [28]
Geothermal plants rely in energy from hot springs to produce electricity so the correct answer is B.
6 0
3 years ago
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Which of these statements are accurate? Hexokinase is a type of transferase that catalyzes the transfer of a phosphoryl group fr
Agata [3.3K]

Answer:

A. The conformational shift that occurs when glucose, but not water, enters the active site prevents water from hydrolyzing ATP. True

B. Hexokinase consists of two domains, or lobes, that come together when glucose and the MgATP2–MgATP2– complex are bound. True  

C. Hexokinase is a type of transferase that catalyzes the transfer of a phosphoryl group from ATP to a hexose. True

Explanation:

A. Hexokinase suffers and conformational changes by binding glucose in a reaction that prevents ATP hydrolysis.

B. Hexokinase is an enzyme with two domains that function by binding to the substrate (i.e., glucose). The region linking both protein domains is responsible for the catalytic activity.

C. Hexokinase is a type of transferase that catalyzes the transfer of a phosphoryl group from ATP to a hexose. During the first stage of glycolysis, the hexokinase transfers one phosphorous group from magnesium-ATP (Mg-ATP) to one hexose molecule, such as fructose, mannose or glucose.

 

False statements:

- Most kinases require the presence of a monovalent metal ion cofactor to prevent ATP hydrolysis. False: In canonical kinases, conserved amino acids bind to divalent metal ions before the transference of the phosphate group to their substrates.

- Hexokinase is found in the mitochondrial membrane. False: Hexokinase is found in the cytosol.

- Hexokinase transfers the terminal phosphate of ATP to carbon 3 of glucose. False: Hexokinase catalyzes the transfer of the terminal phosphate ATP to form glucose 6-phosphate.

5 0
3 years ago
The ions are transported using a pump , which obtains energy by the breaking of ? . This action requires the expense of energy.
Masja [62]
The sodium and potassium ions are transported using a sodium potassium pump the process of moving sodium and potassium ions across the cell membrane.
3 0
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