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>
Answer:
C
Explanation:
DNA polymerase is an enzyme, and when an enzyme is put in conditions that don't suit it, it unravels and becomes useless. Because the copy of DNA isn't being made (S phase is the copying phase, after all), cellular division will come to a stop.
Answer:
an unhealthy climate unhealthy habits unhealthy foods. 2 : not in good health : sickly, diseased unhealthy animals. 3a : risky, unsound an unhealthy economy. b : of a harmful nature : bad, injurious unhealthy levels of lead.
Explanation:
hope this helps
I believe the question is according to the attached image.
The order of the diagram that would show primary succession in an area that had never before been occupied by living organisms is;
C,A, B, D.Primary succession occurs in lifeless areas; these are regions in which soil is incapable of sustaining life as a result of factors such as lava flow, newly formed sand dunes, or rocks left from a retreating glacier.
All of the above are correctly matched.
Glycolysis is the process wherein glucose (from the diet) is broken down to two molecules of pyruvate through a 10-step enzymatic reaction. This reaction occurs in the cell's cytoplasm or cell body. Once pyruvate is formed, the pyruvate dehydrogenase complex, an enzyme complex responsible for converting pyruvate into acetyl-CoA.
Acetyl-CoA will then be transported to the mitochondria and it will cycle through series of reduction-oxidation reactions in the Kreb's cycle (also known as the tricarboxylic acid cycle or the citric acid cycle). Various reducing compounds (NADH and FADH2) are formed and these reducing compounds are oxidized, still, in the mitocondria in the electron transport chain producing ATP via oxidative phosphorylation.
