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AleksandrR [38]
10 months ago
13

In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering t

he cortical reaction.
Biology
1 answer:
crimeas [40]10 months ago
8 0

In the block to polyspermy, entry of the sperm's contents causes calcium ion levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.

In biology, polyspermy describes the fertilization of an egg by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.

The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote. This may occur because sperm are too efficient at reaching and fertilizing eggs due to the selective pressures of sperm competition.

The cortical reaction is a calcium-dependent exocytotic process in which the content of secretory granules is released into the perivitellin space immediately after fertilization, which serves to prevent polyspermic fertilization.

Learn more about  polyspermy here : brainly.com/question/4537960

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A protein that spans the phospholipid bilayer one or more times is
Leona [35]

Answer:

a transmembrane protein

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A transmembrane protein spans the phospholipid bilayer one or more times. they are made of amphiphilic phospholipids: phospholipids with a hydrophilic phosphate head and a hydrophobic tail with two fatty acid chains.

7 0
3 years ago
In the coniferous forests of Oregon, eight species of woodpeckers coexist. Four species select their nesting sites based on tree
dem82 [27]

Answer:

The correct answer is a. resource partitioning

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Resource partitioning is a strategy that species employ to avoid competition. It is based on the selection of different nutrition sources by different organisms that coexist in the same ecological niche, so there is no conflict between them. In the present case, each one of the eight species of woodpeckers feed on different trees, it means that each one select a different tree´s species or, if they select the same species, they use trees of different diameters.

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3 years ago
According to biochemist sidney fox, once amino acids formed in the oceans, they may have collected in small pools to form small
Blizzard [7]

Formed tiny polypeptides known as Proteinoids when they gathered in little pools.

<h3>What is a polypeptide and how does it work?</h3>

Polypeptides. By joining many amino acids together, polypeptides contribute to the creation of proteins. When two or more polypeptides are joined together to form a protein, the resulting structure is unique to that protein.

<h3>What conclusions did Sidney Fox's experiment reach?</h3>

In the 1950s, Sidney Fox demonstrated that when amino acids were splashed in hot, dry circumstances, they immediately polymerized into proteins. Other studies that used cyanide, clays, and heat to cause the polymerization of amino acids into proteins were effective.

To know more about polypeptide visit:-

brainly.com/question/28270191

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8 0
8 months ago
What was the carbon cycle on the prairie like?
raketka [301]

Answer:

It stores more carbon below ground than a forest stores above.

Explanation:

4 0
3 years ago
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A(n) _______ is a well-tested concept that explains a wide range of observations.
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