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maria [59]
3 years ago
12

What is the feature of the cell membrane that causes it to be able to "choose" what materials enter and exit?

Biology
1 answer:
mixer [17]3 years ago
6 0
Cell membranes are semi-permeable. That is why they can allow only some substances to enter the cell. It basically depends on the size of the molecules. Smaller atoms like water can easily pass through. However, macromolecules such as sugars, oils and proteins cannot easily pass because they contain a long chain of monomers.
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Answer:

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The allele O is of recessive to both the blood type A and B. So a person with O blood type have two copies of O allele. But however A and B blood type are dominant of O, a person with A blood type may have one of the two genotypes --  AO or AA. Similarly, with blood type B, the genotypes are BO or BB.

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