Biology

Cellular Respiration and Enzymes

1,551 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

Assertion: The inhibition of glycolysis by oxygen is referred to as Pasteur effect. Reason: This is due to inhibition of the enzyme phosphohexokinase by ATP and 2-hydroxypropane-1,2,3-tricarboxylate (formed in the presence of oxygen).

Directions: In the following question there are two statements, Assertion (A) and Reason (R), consider both the statements independently and mark your answers as under:
1. A and R both are correct and R is correct explanation of A.
2. A and R both are correct and R is not correct explanation of A.
3. A is correct and R is incorrect.
4. A is incorrect and R is correct.
5. A and R both are incorrect.

  1. A and R both are correct and R is the correct explanation of A.

  2. A and R both are correct and R is not the correct explanation of A.

  3. A is correct and R is incorrect.

  4. A is incorrect and R is correct.

  5. A and R both are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A. The inhibition of glycolysis by oxygen is referred to as Pasteur effect. This is due to inhibition of the enzyme phosphohexokinase by ATP and 2-hydroxypropane-1,2,3-tricarboxylate (citrate) (formed in the presence of oxygen).

Multiple choice

Where does Krebs cycle take place?

  1. Cytoplasm

  2. Endoplasmic reticulum

  3. Mitochondria

  4. Ribosomes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Krebs cycle takes place in mitochondria.It is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of ATP.