Free Bioenergetics MCQs with Answers

• A. Methyl alcohol
• B. Acetaldehyde
• C. Formaldehyde
• D. Ethyl alcohol

Explanation: Each pyruvic acid molecule produced during glycolysis is converted to ethyl alcohol in two steps.

• A. Production of amino acids
• B. Production of vitamins
• C. Production of ATP molecules through oxidative phosphorylation
• D. Production of pyruvic acid

Explanation: During steps 3, 4, and 8 of Krebs' cycle, 3 molecules of NADH + H+ are produced by oxidative decarboxylation of isocitrate…

• A. RuBP
• B. RuMP
• C. PGA
• D. PGAL

Explanation: Ribulose bisphosphate (RuBP) is generally referred to as CO2 acceptor because it is capable of combining with carbon dioxide with the help…

• A. More ATPs
• B. Less ATPs
• C. Equal ATPs
• D. Does not produce ATPs

Explanation: During anaerobic respiration, the pyruvic acid molecules are converted either to lactic acid or ethanol with the release of a very small…

• A. Pq
• B. Pc
• C. Fd
• D. NADP+

Explanation: NADP+ (Nicotinamide adenine dinucleotide phosphate) is the final electron and proton acceptor during the light reactions of photosynthesis.

• A. 3 phosphoglycerate
• B. 1-3 biphosphoglycerate
• C. Glyceraldehyde 3 phosphate
• D. Glucose

Explanation: The Calvin cycle, part of photosynthesis, generates G3P (glyceraldehyde 3-phosphate) from three carbon dioxide molecules using ATP and…

• A. Plastoquionone
• B. Cytochrome
• C. Ferridoxin
• D. Plastocyanin

Explanation: Plastocyanin is the copper-containing protein in light-dependent reaction ( Z scheme)

• A. ATP synthesis
• B. Substitution
• C. Decarboxylation
• D. Isomerization

Explanation: The electron transport chain is responsible for the production of ATP through a process called oxidative phosphorylation.

• A. 28
• B. 30
• C. 32
• D. 34

Explanation: Out of the 36 ATPs that can potentially be generated through oxidative phosphorylation and the electron transport chain, approximately…

• A. Isomerase
• B. Dehydrogenase
• C. Kinase
• D. Decarboxylase

Explanation: The major enzymes involved in the transfer of a phosphate group from ATP to glucose are kinases (Option C).

• A. Released
• B. Consumed
• C. Produced
• D. Destroyed

Explanation: Energy is released by the breakdown of complex molecules into simpler ones, and such reactions are called catabolic reactions.

• A. Nucelolus
• B. Chloroplast
• C. Nucleus
• D. Golgi bodies

Explanation: Option B is correct.The process of photophosphorylation takes place in the chloroplast.

• A. Outer membrane
• B. Inner membrane
• C. Granum
• D. Stroma

Explanation: Option C is correct.The light reaction occurs in the grana of the chloroplast.

• A. 2
• B. 18
• C. 32
• D. 36

Explanation: Option A is correct. In alcoholic fermentation, two ATP molecules are produced from one glucose molecule.

• A. 1
• B. 2
• C. 4
• D. 0

Explanation: The correct answer is Option D: 0 ATP. In the preparatory phase of glycolysis, two ATP molecules are utilized to phosphorylate glucose and…

• A. Ribosomes
• B. Lysosomes
• C. Glyoxisomes
• D. Golgi complex

Explanation: Option D is correct.he Golgi complex consists of units called dictyosomes. A dictyosome is a stack of flattened sacs called cisternae.

• A. Glycolysis
• B. Cellular respiration
• C. Fermentation
• D. None of the above

Explanation: This is the correct answer. Glycolysis is the metabolic pathway that breaks down glucose into pyruvate, producing ATP (energy) in the…

• A. Mitochondria
• B. Ribosome
• C. Chloroplast
• D. Amyloplast

Explanation: Chloroplasts are organelles found in autotrophic eukaryotes, such as plants and algae, where photosynthesis takes place.

• A. 400-600 nm
• B. 530-700 m
• C. 620-700 nm
• D. 500-600 nm

Explanation: Carotenoids are a group of pigments that absorb light in the visible spectrum, specifically in the range of 430-470 nanometers (nm).

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: In the non-cyclic electron transport of the light reaction, also known as the Z-scheme, the deficit of electrons occurs in the chlorophyll…