Penetration of the egg' zona pellucida by the sperm cell is a process driven by hydrolytic enzymes.
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The critical step in fertilization is binding between sperm receptors and glycoproteins on the zona pellucida. This is the trigger for the acrosome reaction which includes an influx of CA and a rise in pH and cAMP levels within the sperm head. As a result, the plasma membrane of the sperm fuses with the outer acrosomal membrane and the exocytosis of the acrosomal<span> vesicle occurs. Components of the acrosome, like hydrolytic enzymes, are released and they degrade the <span>zona pellucida allowing</span> the sperm to move </span>inside.</span>
Skin is a barrier that serves as one of the body's first lines of defense against harmful microbes. Specialized immune cells within skin tissue help to fight invading organisms. Past work by an NIH research team showed that commensals can help the body's immune cells fight disease-causing microbes.
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The statement that is true for asexual reproduction is :
D. Genetic information from a single parent is copied and passed on to form offspring with the same genetic information
The offspring that had different genetic information from its parents usually came from sexual reproduction , in which two parents contribute several different genetics
Answer:
The answer is still no;
Explanation:
as they live in water they probably don't take it in as a conscious response to seek out and drink water. Thirst is usually defined as a need or desire to drink water. It is unlikely that fish are responding to such a driving force.
Answer:
The following ratios used to determine ones debt-to-income ratio is : d. 28/36
Explanation:These ratios mean that a person have enough income to handle all of his/her debts. People who involved themselves in the world of finance known as the 28/36, which stated that someone should spend maximum of 28% of gross income on total housing expense and maximum 36% on total debt service
