The end product of glycolysis under anaerobic conditions in muscles is: MCQ with Answer and Explanation

The end product of glycolysis under anaerobic conditions in muscles is:
A. Acetyl CoA
B. Ethanol
C. Carbon dioxide
D. Lactic acid
Answer: Option D
Solution (By JKSSB Mock Tests)
When oxygen is limiting, pyruvate from glycolysis is reduced to lactic acid (lactate) by lactate dehydrogenase, regenerating NAD⁺ to allow glycolysis to continue. In yeast, pyruvate is converted to ethanol and CO₂ (alcoholic fermentation). Muscle cells lack alcohol dehydrogenase.

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Practice More Biology Questions

Question #1
The part of the human ear that converts sound vibrations into neural signals is the:
A. Auditory nerve
B. Ossicles
C. Eardrum
D. Cochlea

Correct Answer: Option D


Explanation:
The cochlea, a spiral-shaped organ in the inner ear, contains the organ of Corti with hair cells that transduce mechanical vibrations into electrical impulses. The eardrum and ossicles conduct sound to the cochlea. The auditory nerve transmits impulses to the brain. Thus, transduction occurs in the cochlea.

This question belongs to: Science Biology
Question #2
Assertion (A): Fermentation produces less ATP than aerobic respiration.
Reason (R): Fermentation involves only glycolysis and does not use the Krebs cycle or electron transport chain.
A. A false, R true.
B. A true, R false.
C. Both A and R are true, but R is not the correct explanation.
D. Both A and R are true, and R is the correct explanation.

Correct Answer: Option D


Explanation:
Fermentation yields only 2 ATP from glycolysis, while aerobic respiration yields ~36-38. The reason correctly explains the lower yield.

This question belongs to: Science Biology
Question #3
Consider statements about ecology: 1. A population consists of individuals of the same species. 2. A community consists of interacting populations. 3. An ecosystem consists of biotic and abiotic components. Which are correct?
A. 1, 2 and 3
B. 2 and 3 only
C. 1 and 3 only
D. 1 and 2 only

Correct Answer: Option A


Explanation:
A population is a group of individuals of the same species living in a specific geographic area and capable of interbreeding. A community comprises all the interacting populations of different species (plants, animals, microbes) living together in a defined area. An ecosystem is a functional unit of nature that encompasses both the biotic (living community) and abiotic (non-living physical environment like soil, water, sunlight) components, interacting as a complex system. All statements are correct.

This question belongs to: Science Biology