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

The enzyme that converts glucose into ethanol in yeast is:
A. Maltase
B. Invertase
C. Lactase
D. Zymase
Answer: Option D
Solution (By JKSSB Mock Tests)
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.

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Question #1
The hormone that stimulates the growth of the ovarian follicle is:
A. Estrogen
B. LH
C. Progesterone
D. FSH

Correct Answer: Option D


Explanation:
Follicle-stimulating hormone (FSH) from the anterior pituitary promotes the growth and maturation of ovarian follicles and stimulates estrogen secretion. LH triggers ovulation, estrogen proliferates endometrium, progesterone maintains it.

This question belongs to: Science Biology
Question #2
Consider statements about genetics: 1. Genes are made of DNA. 2. Chromosomes are located in the nucleus. 3. RNA is the genetic material in all cells. Which are correct?
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 2 only
D. 1, 2 and 3

Correct Answer: Option C


Explanation:
Genes are specific sequences of nucleotides that serve as the fundamental units of heredity, and in all cellular organisms, they are made of DNA (deoxyribonucleic acid). Chromosomes are thread-like structures composed of DNA and proteins, and they are located within the nucleus of eukaryotic cells. DNA is the genetic material in all cellular organisms; RNA serves as the genetic material only in some viruses, not in cells. Thus, statements 1 and 2 are correct.

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Question #3
The deficiency of vitamin B₁₂ often results from lack of which gastric factor?
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Correct Answer: Option D


Explanation:
Intrinsic factor, a glycoprotein secreted by gastric parietal cells, binds to vitamin B₁₂ and facilitates its absorption in the ileum. Absence or deficiency (pernicious anemia) leads to B₁₂ deficiency, causing megaloblastic anemia and neurological symptoms. HCl activates pepsin, pepsinogen is precursor, mucus protects.

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