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Rzqust [24]
3 years ago
9

The process that makes it possible for sperm to penetrate the egg is called __________.

Biology
1 answer:
qwelly [4]3 years ago
7 0
The process is called capacitation
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Help please !!!!!!!!!
klemol [59]
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How do you really know when something is alive? What's your test for deciding if something is alive? How would explain your defi
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Something breathing.
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Water molecules are heated until they become water vapor
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When two heterozygous individual are crossed,the proportion of the offspring that are true breeding for dominant trait is
Angelina_Jolie [31]

Answer:

75%

Explanation:

If you drew a Punnett Square, you will see that the possible outcomes would be AA, Aa, aA, and aa. Three out of the four would exhibit the dominant trait.

8 0
3 years ago
A small percentage of the body’s iron supply circulates freely in the blood, bound to a protein called transferrin. Transferrin
german

Answer:

What best describes how transferrin is transported through the erythrocyte plasma membrane is receptor-mediated endocytosis.

Explanation:

The incorporation of transferrin across the erythrocyte membrane depends on a transferrin receptor expressed on the surface of the membrane. The specific receptor recognizes the presence of iron-charged transferrin, transferin diferrica, incorporating it into the cell by endocytosis. Once in the cytoplasm, the iron is dissociated from the transferrin.

Free transferrin is called apotransferrin. The transferrin receptor has a high affinity for transferrin di-ferrica, which facilitates its incorporation by endocytosis, and the release of apotransferrin into the extracellular space.

The other options are not correct because:

<em>     A. </em><u><em>Exocytosis</em></u><em> implies the exit of substances from the cell.</em>

<em>     B. </em><u><em>Pinocytosis</em></u><em> involves the invagination of the membrane to incorporate soluble substances into the cell.</em>

<em>     C. </em><u><em>Phagocytosis</em></u><em> is the incorporation of solid substances by invagination of the membrane.</em>

4 0
3 years ago
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