The above question illustrates aerobic cellular respiration, specifically the second stage called Kreb's cycle or Citric acid cycle. This process occurs in the inner membrane of the mitochondrion of eukaryotic cells called MATRIX.

It occurs when the pyruvic acid produced during Glycolysis (first stage of cellular respiration that occurs in the cytoplasm) is converted to Acetyl CoA in order to enter the citric acid cycle in the mitochondrion. The Acetyl CoA is then used in a series of reactions that comprises of reduction-oxidation, hydration, dehydration, and decarboxylation.

This reactions involving 8 steps converts the Acetyl CoA (from pyruvic acid) to 2 molecules of CO2, 1 molecule of GTP/ATP, and electron donors NADH2 and FADH2.

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3 years ago

What are prions? (A) mobile segments of DNA (B) tiny circular molecules of RNA that can infect plants (C) viral DNA that attache

larisa86 [58]

Prions are misfolded versions of normal proteins that can cause diseases. So the correct option is D.

<h3>What leads to prion disease? </h3>

A misfolded confirmation of proteins is called Prions. These misfolded proteins can result in harmful functional proteins and cause several diseases.

A prion is the type of protein that usually cause the normal proteins in the brain to fold in an abnormal manner. This results in misfolding of proteins in the brain.

Prion diseases are known to affect both humans and animals. Sometimes, humans get prion diseases by consumption of by meat from infected animals.

Creutzfeldt-Jakob disease is the most common prion disease in humans. The occurrence of prion diseases is rare. In the US, about 300 cases are reported every year.

Therefore the correct option is D.