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Ira Lisetskai [31]
2 years ago
9

The phrase “too large or too charged” is a helpful way to remember what kinds of molecules need to cross the cell membrane via a

n intermembrane protein, rather than by crossing directly through the phospholipid bilayer.
Describe why some molecules can pass directly through the phospholipid bilayer, while those that are too large or too charged need to pass through a membrane protein.
Biology
1 answer:
saveliy_v [14]2 years ago
5 0

Answer:

Due to their hole size.

Explanation:

Some molecules can pass directly through the phospholipid bilayer because of their small size which can easily pass through the small holes of phospholipid bilayer, while those that are too large or too charged need to pass through a membrane protein because membrane protein has a large holes through which large molecules can easily pass through the semi-permeable membrane of the cell by active or passive transport.

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Gene flow (or gene migration) is a mechanism of evolution (change the allele frequencies) which transfers genetic variation among populations due to migration. High level of gene flow decreases the genetic differentiation between the two populations.

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3 years ago
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The villi of the small intestine use active transport to take up nutrients after concentration has reached equilibrium.

<h3>What is Active transport?</h3>

Active transport may be defined as the process that occurs against the concentration gradient and is mediated by carrier proteins. Metabolic energy is used to move ions or molecules against a concentration gradient.

During the process of digestion, the villi in the small intestine enthrall the soluble nutrients gradually. Over time, the concentration of nutrients in the villi acquires an equilibrium with the concentration in the gut. Until here, the nutrient uptake is carried by the process of passive diffusion.

But after attaining the equilibrium, the nutrient uptake is carried by the process of active transport.

The complete question is as follows:

What part of the body uses active transport to take up nutrients after concentration has reached equilibrium?

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Therefore, the correct option for this question is C, i.e. small intestine.

To learn more about Active transport, refer to the link:

brainly.com/question/18434867

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<h2>Answer:</h2>

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