The enzyme that catalyzes the conversion of pyruvate to acetyl-CoA is: MCQ with Answer and Explanation

The enzyme that catalyzes the conversion of pyruvate to acetyl-CoA is:
A. Pyruvate dehydrogenase
B. Lactate dehydrogenase
C. Citrate synthase
D. Pyruvate kinase
Answer: Option A
Solution (By JKSSB Mock Tests)
Pyruvate dehydrogenase complex (PDC) oxidatively decarboxylates pyruvate, producing acetyl-CoA, NADH, and CO₂ in the mitochondrial matrix, linking glycolysis to the Krebs cycle. Pyruvate kinase is in glycolysis, lactate dehydrogenase converts pyruvate to lactate, citrate synthase starts the Krebs cycle.

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Practice More Biology Questions

Question #1
The type of fruit that develops from a single flower with multiple carpels fused together is:
A. Aggregate fruit
B. Multiple fruit
C. Accessory fruit
D. Simple fruit

Correct Answer: Option D


Explanation:
A simple fruit develops from a single ovary of a single flower, which may be a single carpel or fused carpels (e.g., tomato, peach). Aggregate fruits develop from separate carpels of one flower (e.g., strawberry). Multiple fruits from many flowers (e.g., pineapple).

This question belongs to: Science Biology
Question #2
The enzyme that breaks down fats in the digestive system is:
A. Pepsin
B. Sucrase
C. Lipase
D. Amylase

Correct Answer: Option C


Explanation:
Lipase, primarily pancreatic lipase, hydrolyzes triglycerides into monoglycerides and free fatty acids in the small intestine, aided by bile salts that emulsify fats. Amylase digests starch, pepsin proteins, sucrase sucrose. Lipases are also secreted by lingual and gastric glands but pancreatic lipase is the main.

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Question #3
In a dihybrid cross, the F₂ phenotypic ratio is:
A. 1:1
B. 9:3:3:1
C. 1:2:1
D. 3:1

Correct Answer: Option B


Explanation:
Mendel's dihybrid cross (e.g., yellow round × green wrinkled) gave a 9:3:3:1 phenotypic ratio in the F₂ generation, illustrating independent assortment.

This question belongs to: Science Biology