Question

please answer all :)

1. What description of the second stage of the citric acid cycle is true?

It starts with a four-carbon molecule and ends with a four-carbon molecule.

It starts with a six-carbon molecule and ends with a five-carbon molecule.

It starts with a four-carbon molecule and ends with a five-carbon molecule.

It starts with a five-carbon molecule and ends with a four-carbon molecule.

It starts with a four-carbon molecule and ends with a six-carbon molecule.

2. What statement is incorrect about the reaction catalyzed by citrate synthase in the citric acid cycle?

Its balanced chemical equation is: oxaloacetate + acetyl-CoA →citrate + CoA + H2O

It proceeds through a mechanism involving the formation of a citryl-CoA intermediate.

The mechanism of the enzyme which catalyzes the reaction is an example of general acid-base catalysis.

The enzyme catalyzing the reaction is allosterically activated by ATP.

3. What is the site for oxidative decarboxylation of pyruvate?

mitochondrial intermembrane space

liver

cytoplasm

mitochondrial matrix

endoplasmic reticulum

4. Where is cytochrome c located?

endoplasmic reticulum membrane

cytoplasm

mitochondrial intermembrane space

mitochondrial matrix

mitochondrial inner membrane

Answer 1