Free Bioenergetics MCQs with Answers

• A. Bluish green
• B. Yellowish green
• C. Dark green
• D. Reddish green

Explanation: Bluish green - Correct. Chlorophyll-a absorbs red and blue light, reflecting a bluish-green color.

• A. Photolysis of water
• B. Production of ATP by photophosphorylation
• C. Reduction of Carbon dioxide
• D. Reduction of NADP to NADPH

Explanation: Reduction of Carbon dioxide - Correct. Carbon dioxide reduction occurs in the Calvin cycle, which is part of the light-independent…

• A. ATP
• B. Glucose
• C. Amino acid
• D. Fatty acid

Explanation: The direct source of energy in living bodies is ATP (Adenosine Triphosphate).

• A. 1st
• B. 2nd
• C. 3rd
• D. 4th

Explanation: 1st - Correct. In chlorophyll a, a methyl (-CH₃) group is attached to the first pyrrole ring, distinguishing it from chlorophyll b, which…

• A. 2 ATP
• B. 4 ATP
• C. 6 ATP
• D. 3 ATP
• E. 8 ATP

Explanation: One glucose molecule yields four ATP molecules in total during glycolysis.

• A. 4 carbon compound
• B. 5 carbon compound
• C. 6 carbon compound
• D. 3 carbon compound

Explanation: The correct answer is E 3-carbon compound. Pyruvic acid is a three-carbon compound.

• A. NHDP
• B. ADP
• C. ATP
• D. NADH

Explanation: ATP stands for adenosine triphosphate, which is a molecule that serves as the primary energy currency in living organisms.

• A. Cristae
• B. Stroma
• C. Cisternae
• D. Thylakoid

Explanation: Light reaction of photosynthesis takes place in the thylakoid membrane consisting of grana within it. So option D is the correct answer.

• A. Broken-down, Regenerate
• B. Generated, Broken-down
• C. Oxidized, Reduced
• D. Reduced, Oxidized

Explanation: In the electron transport chain, the carriers are responsible for shuttling electrons from one component to another.

• A. Photophosphorylation
• B. Z-Scheme
• C. Photolysis
• D. Mechanism of ATP synthesis

Explanation: The electron transport chain is a key component in the mechanism of ATP synthesis.

• A. Blueish green
• B. Yellowish green
• C. Dark Green
• D. Reddish green

Explanation: Chlorophyll-b is a secondary pigment that absorbs light primarily in the blue and red-orange wavelengths, giving it a yellowish-green…

• A. Cramps
• B. High consumption of energy
• C. Pain
• D. Tiredness

Explanation: Anaerobic respiration is a less efficient process compared to aerobic respiration, which occurs in the presence of oxygen.

• A. 2 ATP
• B. 4 ATP
• C. 34 ATP
• D. 36 ATP

Explanation: Respiration is defined as the oxidation of food molecules that release energy in the form of ATP.

• A. Grana
• B. Stroma
• C. Intergranum
• D. Outer membrane of chloroplast

Explanation: Chloroplasts are biconvex disc-like organelles that are surrounded by a double membrane.

• A. Proteins only
• B. Ribosomes only
• C. Small circular DNA only
• D. Proteins, Ribosomes, and small circular DNA

Explanation: Chloroplasts are chlorophyll-containing organelles in plant cells; they play a vital role in life on Earth since photosynthesis takes…

• A. 300-650 nm
• B. 350-700 nm
• C. 380-750 nm
• D. 430-790 nm

Explanation: The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view.

• A. Van Niel
• B. Lysenko
• C. Calvin
• D. Kreb

Explanation: Scientist Cornelius Van Niel first postulated in the 1930s that the oxygen released from photosynthesis comes from the water molecule.

• A. Two
• B. Three
• C. Four
• D. Five

Explanation: Calvin cycle is a cyclic enzyme-controlled process which involves the reduction of carbon dioxide in the presence of ATP and NADPH to form…

• A. 40 to 60
• B. 25 to 50
• C. 50 to 70
• D. 100 to 200

Explanation: Each granum consists of 25-50 thylakoids in it. Hence, option B is the correct option.

• A. Formation of energy rich carbohydrates
• B. Hydrolysis of water
• C. ATP generation
• D. Production of reducing molecule

Explanation: Hydrolysis of water, ATP generation, and production of reducing molecules are all part of the light-dependent phase of photosynthesis.