Question

6. The active site A. is located on an enzyme. B. is rich in amino acids. C. is located on a substrate. D. A. and B. E. B. and C.

Answer 1

6. D

Active site of enzyme is having a specific shape and is is complementary to a specific substrate. This active site is lined by specific amino acids which determine the shape and hence bind with the specific substrate. Any change in the amino acids present in the active site leads to the change in the shape of active site and therefore the substrate cannot bind to the enzyme anymore and hence no catalysis occur.

9. C

​​​​​​Cellular respiration, aerobic respiration which takes place in the presence of oxygen is the complete oxidation of glucose into two molecules of pyruvic acid and then acetyl coenzyme A which enters citric acid cycle. In the end electron transport chain occurs which leads to the formation of ATP from high energy electron carriers. So the agent which is oxidizing glucose is Oxygen.

10. A

Glycolysis is a 10 step process which takes place in cytoplasm. It is a common step between aerobic and anaerobic respiration. It is The breakdown of glucose into two molecules of pyruvic acid. So the substrate is one molecule of glucose and product is two molecules of pyruvic acid.

12. D

Option A B and C are the products formed in tricarboxylic acid cycle. Carbon dioxide is formed in the decarboxylation of pyruvic acid to acetyl coenzyme A.

Please rate.