Free Bioenergetics MCQs with Answers

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Three CO2 molecules enter Calvin cycle per 3 RUBP molecules. to generate one molecule of carbohydrates.

• A. Cellulose
• B. Rubisco
• C. Actin
• D. Myosin

Explanation: The most abundant protein on Earth is RuBisCO, which stands for Ribulose-1,5-bisphosphate carboxylase/oxygenase.

• A. Coenzymes
• B. Prosthetic group
• C. Activator
• D. Ribozyme

Explanation: Cytochromes are electron transport intermediates that contain heme as a prosthetic group.

• A. Pyruvic acid
• B. Lactic acid
• C. Ethyl alcohol
• D. Acetyl CoA

Explanation: C3H6O3 is the chemical formula for lactic acid.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: When electrons move from cytochrome b to cytochrome c, they release a small amount of energy.

• A. All types of cells
• B. All anaerobic cells
• C. All primitive cells
• D. All aerobic cell

Explanation: Oxidative phosphorylation, the synthesis of ATP in the presence of oxygen, occurs in all aerobic cells.

• A. Alpha ketoglutaric acid
• B. Citric acid
• C. Glyceric acid
• D. Acetic acid

Explanation: Before entering the Krebs cycle, pyruvate is first decarboxylated and oxidized into acetyl-CoA.

• A. Non-cyclic phosphorylation
• B. Cyclic phosphorylation
• C. Cyclic oxidation
• D. Oxidative phosphorylation

Explanation: The Z-scheme is a graphical representation of the electron transport pathway in non-cyclic photophosphorylation.

• A. ATP
• B. NADP
• C. NADP and ATP
• D. NADP, ATP and oxygen

Explanation: The product(s) of cyclic phosphorylation are ATP only.Cyclic phosphorylation is a process that occurs in the chloroplasts of plants.

• A. 6
• B. 3
• C. 8
• D. 18

Explanation: The total NADH formed by one glucose molecule during the Krebs cycle is 3*2=6.

• A. Fumarate to malate
• B. Succinate to fumarate
• C. Malate to oxaloacetate
• D. Alpha Ketoglutarate to succinate

Explanation: Only one molecule of FADH2 is produced in the Krebs cycle during the conversion of succinate to fumarate.FADH2 is a reduced form of flavin…

• A. Cytochrome A
• B. Oxygen
• C. Cytochrome a3
• D. Cytochrome C

Explanation: The final acceptor of electrons in the respiratory chain is oxygen. Oxygen is a highly electronegative molecule, which means that it has a…

• A. Cytochrome a
• B. Cytochrome b
• C. Cytochrome a3
• D. Cytochrome Q

Explanation: Cytochrome a3, also known as cytochrome c oxidase or Complex IV, is a crucial enzyme in the electron transport chain of cellular…

• A. Plastoquinone
• B. Ferredoxin
• C. Cytochrome complex
• D. Plastocyanin

Explanation: Ferredoxin is a small iron-sulfur protein that acts as an electron carrier in photosynthetic organisms.Ferredoxin receives electrons from…

• A. Glycolysis
• B. Pyruvic acid oxidation
• C. Krebs cycle
• D. Respiratory chain

Explanation: "The explanation for this question will be added soon!".

• A. 1 and 2
• B. 1,2 and 3
• C. 1,3 and 4
• D. 1,2,3 and 4

Explanation: At stage 1,2 and 3, decarboxylation take place.

• A. In the fluid matrix of cytoplasm
• B. In the mitochondria! matrix
• C. In the nuclear sap
• D. On the cristae of a mitochondrion

Explanation: Enzymes located in the fluid matrix of cytoplasm are involved in the chemical reactions which occur during glycolysis.

• A. Fixes carbon dioxide
• B. Works only in the presence of light
• C. Traps light energy
• D. Synthesis of ATP

Explanation: The second of these systems fixes carbon dioxide.

• A. PS I
• B. PS II
• C. ATP
• D. NADP+

Explanation: The final acceptor of electron during non-cyclic electron pathway is NADP+ .

• A. Formation of ATP
• B. Involvement of both PSI and PSI I pigment systems
• C. Release of NADPH
• D. Release of O2

Explanation: This option is incorrect, as formation of ATP is observed during cyclic phosphorylation as well as noncyclic phosphorylation.