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3 years ago

Explain why an individual that is heterozygous for this inversion would be partially sterile

1 answer:

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<span>Heterozygotes for inversion have a serious problem chromosome pairing at meiosis and recombination within the characteristic loop leads to chromosome duplication, deficiencies and in some cases two centro meters after recombination in meiosis.The abnormalities are usually not recovered in next generation because gametes or zygotes are receiving them are in-viable.</span>

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Cholesterol's main role in the membrane seems to be:

olga nikolaevna [1]

Answer:

E) Improve membrane fluidity

Explanation:

Cholesterol constitutes the basic structural element of the skeleton of cell membranes. Without their reinforcement, the membranes would become extremely fluid and lose their consistency. Cholesterol is found in the esterified membranes in its hydroxyl group (OH): with fatty acids, mainly oleic and linoleic, or as cholesterol sulfate. The cholesterol-sulfate polar group is disposed on one of the faces of the membrane that interacts with other polar groups in that area, while its bulky hydrophobic portion is embedded between the apolar parts of the lipids that form the membrane skeleton and They fulfill many other functions, among which the reduction in the permeability of protons and sodium ions, and their participation in signal transmission. Cholesterol is also essential in phagocytosis processes carried out by cells to capture many nutrients and, in general, for the function of cleaning up organic waste produced by macrophages.

The membranes must have a fluid structure so that the integrated proteins can move "horizontally" to interact with their ligands and with other proteins. The fluidity is given by unsaturated fat. With the excess of saturated fat, the membranes become rigid, but only with the necessary unsaturated fat the membranes are extremely fluid and very sensitive to temperature changes. Cholesterol stabilizes the structure of the membranes; In order for them to have the correct structure, they must have the correct proportions of saturated, unsaturated fats and cholesterol. The membranes produced in the laboratory without cholesterol are unstable to temperature changes, drastically modifying their fluidity against the small temperature changes that occur in the physiological range.

In addition to its functions in cell membranes, cholesterol is an important product that metabolism uses as a raw material to make other compounds:

*Bile salts

*Sex hormones

*Hormones of the adrenal cortex (corticosteroids)

*Vitamin D (Calciferol)

3 0

3 years ago

Water is warmed by the sun and

defon

And cooled by night...

7 0

3 years ago

Choose the best experimental design to test the question “Does the gender of mice affect the time it takes to learn mazes?”

FrozenT [24]

In making an experiment their are two types of variable that should be consider, one is the dependent variable and the other one is the independent variables. I the question that dependent variable would be the result or the effect of the gender of mice and the independent is the ways in determining it. So the variables should be fair if you want your result to have no bias. Thus the answer would be letter B. because it has the same variables but different in gender

7 0

3 years ago

Read 2 more answers

What component of amino acid structure varies among different amino acids?

NISA [10]

<h2>Answer </h2>

The components of the r group of amino acid structure varies among different amino acids

<u>Explanation </u>

As the functional group for amino acids is as:

R-CH-COOH

NH2

only R differs so amino acids also differs. If R is “H” then amino acid is glycine and if R is “CH3” then amino acid is alanine. Hence, R is different for different amino acids. Other components as alpha carbon ( C ), carboxyl group ( COOH ) and amino group ( NH2 ) is fixed for every amino acid.

4 0

3 years ago

Read the following passage and construct a flow chart by matching the following events with their proper sequence. Physical exer

blsea [12.9K]

Answer:

Person starts to exercise.

Skeletal muscle oxygen demand increase

Skeletal muscle metabolism increases

.Blood delivery to the skeletal muscle increases is order to provide more oxygen

Oxygen sensors cause local blood cell vessels to dilate

This steps briefly describe the physiology of exercise.

At the onset of exercise, skeletal muscles cells were sustained with available oxygen from the Myoglobin. Myoglobin is oxygen binding and storage protein found in cardiac and skeletal muscles cells. it has high storing capacity for oxygen.

However as the exercise becomes intense ATPs supply drops, oxygen demand increases,cellular metabolisms demand also increase to supply glucose and ATP to the cells.

The liver mediates Gluconeogenesis. Fatty acid is broken down to glucose for cellular respiration with' ketone bodies build up..Exercise also stimulates the breakdown of muscle glycogen to glucose, Therefore, cellular respiration takes place to break down the glucose to C02, H20 and energy with rise in temperature.

However, oxygen concentration is low, therefore muscles cells undergo anaerobic respiration with lactic acid pathway. Lactic acid build up in muscles cells.The muscles cells under go oxygen debt to break down lactic acid to glucose in muscle.

Therefore to adjust the mechanism oxygen homeostatic sensors increases hyperventilation to increase oxygen intake through the lungs, and vasodilation. so that maximum volume of blood containing oxygen is transported to muscles cells; to sustain the intense activity

Explanation:

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4 years ago