The double helix structure of DNA was elucidated by: MCQ with Answer and Explanation

Question
The double helix structure of DNA was elucidated by:
A. Watson and Crick
B. Meselson and Stahl
C. Hershey and Chase
D. Avery, MacLeod, and McCarty
Answer: Option A
Solution (By JKExamLibrary)
The double helix structure of DNA was elucidated by James Watson (an American biologist) and Francis Crick (a British physicist) in 1953 at the University of Cambridge. Their model was based on X-ray diffraction data produced by Rosalind Franklin and Maurice Wilkins. They proposed that DNA consists of two antiparallel strands held together by hydrogen bonds between complementary base pairs (A-T, G-C).
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Question #1
The type of algae that is used as a dietary supplement and is a rich source of protein is:
A. Chlorella
B. Polysiphonia
C. Sargassum
D. Gelidium
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Correct Answer: Option A

Explanation:
Chlorella and Spirulina (a cyanobacterium) are used as single-cell proteins and health supplements due to their high protein content (up to 60%) and essential nutrients. Gelidium is used for agar, Sargassum is a brown alga, Polysiphonia a red alga. Chlorella is a unicellular green alga.
This question belongs to: Science Biology
Question #2
Assertion (A): The bacterial cell wall is composed of peptidoglycan.
Reason (R): Peptidoglycan provides structural strength and prevents osmotic lysis.
A. A true, R false.
B. Both A and R are true, and R is the correct explanation.
C. A false, R true.
D. Both A and R are true, but R is not the correct explanation.
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Correct Answer: Option B

Explanation:
Bacterial cell walls contain peptidoglycan (murein), a unique polymer that maintains cell shape and protects against osmotic pressure. The reason correctly explains why peptidoglycan is essential.
This question belongs to: Science Biology
Question #3
Which vitamin is also known as ascorbic acid?
A. Vitamin D
B. Vitamin A
C. Vitamin B₁
D. Vitamin C
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Correct Answer: Option D

Explanation:
Vitamin C, chemically ascorbic acid, is a water-soluble vitamin essential for collagen synthesis, wound healing, iron absorption, and antioxidant function. Its deficiency causes scurvy (bleeding gums, weakness). Vitamin A is retinol, B₁ is thiamine, D is calciferol. Vitamin C is abundant in citrus fruits, guava, amla. It is heat-labile and easily destroyed by cooking.
This question belongs to: Science Biology
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