The enzyme that converts glucose to ethanol in yeast fermentation is: MCQ with Answer and Explanation

The enzyme that converts glucose to ethanol in yeast fermentation is:
A. Pepsin
B. Urease
C. Zymase
D. Invertase
Answer: Option C
Solution (By JKSSB Mock Tests)
Zymase is the enzyme complex in yeast (Saccharomyces cerevisiae) that catalyzes the anaerobic breakdown of glucose to ethanol and CO₂ (alcoholic fermentation). Invertase hydrolyzes sucrose to glucose and fructose. Urease acts on urea. Pepsin is a protease. Fermentation is used in baking and brewing industries. The overall equation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂.

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Question #1
The scientist who introduced the binomial system of classification was:
A. Aristotle
B. Theophrastus
C. Charles Darwin
D. Carolus Linnaeus

Correct Answer: Option D


Explanation:
Carolus Linnaeus, in his 10th edition of Systema Naturae (1758), systematically applied binomial nomenclature, giving each species a genus and species name. Earlier workers used polynomial names. Linnaeus is the father of taxonomy.

This question belongs to: Science Biology
Question #2
Consider statements about human physiology: 1. The stomach secretes acid for digestion. 2. The small intestine is the main site of absorption. 3. The liver produces bile. Which are correct?
A. 1 and 2 only
B. 1 and 3 only
C. 1, 2 and 3
D. 2 and 3 only

Correct Answer: Option C


Explanation:
The stomach's gastric glands secrete hydrochloric acid (HCl), which creates an acidic environment necessary for the activation of pepsin and the initial digestion of proteins. The small intestine, with its vast surface area provided by villi and microvilli, is the primary site for the final digestion and absorption of most nutrients into the bloodstream. The liver is a large, multifunctional organ that continuously produces bile, which is stored in the gall bladder and released into the small intestine to emulsify fats. All statements are correct.

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Question #3
The respiratory pigment in earthworm is:
A. Hemoerythrin
B. Hemocyanin
C. Myoglobin
D. Hemoglobin

Correct Answer: Option D


Explanation:
Earthworms have hemoglobin dissolved in their blood plasma (not in cells) for oxygen transport. Hemocyanin is in mollusks and arthropods, hemerythrin in some marine worms.

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