How is cellular metabolism regulated? How is photosynthesis regulated? Identify
ID: 199103 • Letter: H
Question
How is cellular metabolism regulated? How is photosynthesis regulated? Identify specific steps or general concepts.
A) Glycolysis is inhibited when cellular energy levels are abundant.
B) In the electron transport chain, electrons decrease in energy level as they are transferred from one electron carrier to the
next.
C) Citric acid cycle activity is dependent solely on availability of substrate; otherwise it is unregulated.
D) Reactions of the citric acid cycle take place in the mitochondrial matrix.
Explanation / Answer
Cellular metabolism can be regulated by enzymatic actions in respiratory process.Glycolysis is regulated by phosphofructo kinase and pyruvate kinase. Photosynthesis is regulated by the light availability to the phtosystems 1 and 2 which declines the availability of electrons to be transferred. All the given points A,B,C and D are correct which supports the above questions.