The answer is an envelope.
A virus is an infectious agent that can replicate only inside a host cell. When it is outside the cell, it consists of genetic material coated with protein capsid. Some viruses also have an envelope which covers capsid. The function of the envelope is to identify and bind some receptor sites on the host membranes. After fusing with the cell membrane, it allows to capsid and genetic material to enter the cell and infect it.
Acetyl CoA is a feed forward activator of the enzyme <u> pyruvate carboxylase</u> ensuring sufficient oxaloacetate for the citric acid cycle to continue.
<h3>Why does acetyl-CoA stimulate pyruvate carboxylase?</h3>
Acetyl-CoA selectively activates pyruvate carboxylase. When acetyl-CoA concentrations are high, organisms use pyruvate carboxylase to divert pyruvate from the TCA cycle because acetyl-CoA is a crucial metabolite in the TCA cycle that generates a lot of energy. The production of more oxaloacetate is triggered by an excess of mitochondrial acetyl-CoA.
Acetyl coenzyme A, often known as acetyl-CoA, is a crucial component in metabolism and is involved in numerous metabolic processes. Its major job is to transport the acetyl group's carbon atoms to the Krebs cycle, where they can be oxidized to produce energy. When there is an abundance of acetyl CoA available, the mitochondrial enzyme pyruvate carboxylase (PC) catalyzes the conversion of pyruvate to oxaloacetate.
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C. NH3 - organic nitrogen
