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

Question
The enzyme that converts glucose into ethanol in yeast is:
A. Lactase
B. Maltase
C. Invertase
D. Zymase
Answer: Option D
Solution (By JKExamLibrary)
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.
This question belongs to: Science Biology
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Question #1
Consider statements about ribosomes: 1. They are non-membranous organelles. 2. Prokaryotic ribosomes are 80S. 3. They are the site of protein synthesis. Which are correct?
A. 1, 2 and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only
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Correct Answer: Option B

Explanation:
Ribosomes are dense, spherical, non-membranous structures composed of RNA and proteins. They are the cellular factories for protein synthesis. Prokaryotic ribosomes are 70S (50S + 30S subunits), while eukaryotic cytoplasmic ribosomes are 80S (60S + 40S subunits). Therefore, statements 1 and 3 are correct, but statement 2 is false.
This question belongs to: Science Biology
Question #2
Which of the following statements about the human eye is correct?
A. The fovea has the highest concentration of rods.
B. The blind spot contains a high density of cones.
C. The pupil is an opening that cannot change size.
D. The lens changes shape to focus on near or distant objects.
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Correct Answer: Option D

Explanation:
Accommodation involves lens shape change via ciliary muscles. The blind spot lacks photoreceptors; fovea has high cone density; pupil adjusts via iris.
This question belongs to: Science Biology
Question #3
Identify the INCORRECT statement about carbohydrates:
A. They are composed of carbon, hydrogen, and oxygen.
B. Cellulose is a storage carbohydrate in plants.
C. Glycogen is the storage form in animals.
D. Starch is a polysaccharide.
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Correct Answer: Option B

Explanation:
Cellulose is a structural polysaccharide, not storage. Starch is storage in plants. Glycogen is animal storage. So C is incorrect.
This question belongs to: Science Biology
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