Biology

Cellular Respiration and Enzymes

1,721 Questions

Explore key concepts of cellular respiration, including glycolysis, the Krebs cycle, and the electron transport chain. These questions also cover ATP production, anaerobic respiration, and essential metabolic pathways. This topic forms a core part of the biology syllabus for many competitive examinations.

Glycolysis and metabolic pathwaysKrebs cycle processesElectron transport chainATP production countAnaerobic respiration products

Cellular Respiration and Enzymes Questions

Multiple choice

Which of the following pairs represents hydrolases only?

  1. Acetate kinase and alanine deaminase

  2. Glucose-phosphate isomerase and alanine racemase

  3. Oxalate decarboxylase and isocitrate lyase

  4. Lipase and sucrase

  5. Cytochrome oxidase and lactate dehydrogenase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is the correst answer.

Multiple choice

Which of the following statements regarding metabolites is INCORRECT?

  1. Alcohol is a primary metabolite.

  2. The metabolome forms a large network of metabolic reactions.

  3. The rate of degradation of a metabolite is an important determinant of the duration and intensity of its action.

  4. Some antibiotics use sceondary metabolites as precursors.

  5. A secondary metabolite has an important ecological function.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Some antibiotics use primary metabolites as precursors.

Multiple choice

Actinomycin is responsible for

  1. reconversion of ADP into ATP

  2. release of Ca ions

  3. muscle contraction

  4. reformation of ATP
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Actinomycin is responsible for muscle contraction.

Multiple choice

The proteins which accelerate metabolic reactions and known as catalytic proteins are:

  1. Enzymes

  2. Conjugated Proteins

  3. Simple Proteins

  4. Derived Proteins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Majority of the proteins are the most variable and highly specialized enzymes. Acting as organic catalysts, they accelerate metabolic reactions. Virtually, every type of metabolic reaction is driven by a particular or specific type of enzyme. Hence, metabolic reactions of thousands of different kinds in every cell require enzymes of thousands of different kinds. In fact, the basis of the phenotypic expression of every hereditary characteristic is a specific type of metabolic reaction which  in turn, is driven by a specific type of enzyme. Synthesis of defective or abnormal enzymatic proteins, therefore, forms the basis of genetic diseases. About 1400 such diseases are known in case of human beings.

Multiple choice

Which of the following statements about pentose phosphate pathway are correct?

a. It is an anabolic pathway. b. NADPH produced in this pathway is required for the prevention of the oxidative stress. c. The first step of PP pathway is a rate limiting step and is irreversible. d. Epimerase converts ketose ribulose-5-phosphate to aldose ribose-5-phosphate.

  1. All of the above

  2. Only a, b and c

  3. Only b, c and d

  4. Only a and b

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. It is an anabolic pathway. NADPH produced in this pathway is required for the prevention of the oxidative stress. The first step of PP pathway is a rate limiting step and is irreversible.

Multiple choice

Which of the following enzymes is not involved in TCA?

  1. Citrate synthase

  2. Fumarase

  3. Malate dehydrogenase

  4. Malate synthase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Malate synthase is not involved in TCA cycle. It catalyses combination of glyoxylate with acetyl CoA to produce malate in glyoxylate pathway.