Respiration in Plants
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

During aerobic respiration, where does oxidative phosphorylation take place?

Cytoplasm
Outer mitochondrial membrane
Inner mitochondrial membrane
Nucleus
3

Oxidative phosphorylation occurs in the inner mitochondrial membrane via the electron transport system.

Which process in respiration directly produces ATP without the involvement of the electron transport chain?

Glycolysis
Krebs cycle
Oxidative phosphorylation
Electron Transport Chain
1

ATP is directly synthesized in glycolysis through substrate-level phosphorylation without the involvement of the electron transport chain.

Which of the following molecules is required for the conversion of pyruvate to Acetyl-CoA?

ATP
NAD⁺
FADH₂
Oxygen
2

NAD⁺ is required to accept electrons during the oxidative decarboxylation of pyruvate to Acetyl-CoA.

Which compound is the immediate precursor of Acetyl-CoA in respiration?

Glucose
Pyruvate
Oxaloacetate
Citrate
2

Pyruvate undergoes oxidative decarboxylation to form Acetyl-CoA before entering the Krebs cycle.

Which of the following statements about the respiratory quotient (RQ) is INCORRECT?

RQ for carbohydrates is 1.
RQ for fats is greater than 1.
RQ for proteins is less than 1.
RQ value depends on the type of respiratory substrate used.
2

The RQ for fats is less than 1 because fats require more oxygen for oxidation.

Which of the following statements about glycolysis is INCORRECT?

It occurs in the cytoplasm.
It results in the production of pyruvate.
It requires oxygen to proceed.
It is the first step in both aerobic and anaerobic respiration.
3

Glycolysis does not require oxygen; it occurs under both aerobic and anaerobic conditions.

Which molecule serves as the immediate energy source for cellular activities?

NADH
ATP
Glucose
FADH₂
2

ATP (Adenosine Triphosphate) is the immediate energy source for various cellular activities.

Which process releases the least amount of energy per molecule of glucose?

Aerobic respiration
Krebs cycle
Fermentation
Electron Transport Chain
3

Fermentation releases the least energy (only 2 ATP per glucose molecule) compared to other respiration pathways.

Which structure in plants facilitates oxygen intake and carbon dioxide release?

Cuticle
Lenticels
Xylem
Phloem
2

Lenticels are small openings in woody stems that facilitate gas exchange in plants.

Which of the following enzymes is involved in the first step of the Krebs cycle?

Hexokinase
Citrate synthase
Pyruvate dehydrogenase
ATP synthase
2

Citrate synthase catalyzes the reaction between Acetyl-CoA and oxaloacetic acid to form citrate, the first step of the Krebs cycle.

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