Consider statements about scientists: 1. Carolus Linnaeus developed binomial nomenclature. 2. Louis Pasteur developed the rabies vaccine. 3. Gregor Mendel discovered the structure of DNA. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about scientists: 1. Carolus Linnaeus developed binomial nomenclature. 2. Louis Pasteur developed the rabies vaccine. 3. Gregor Mendel discovered the structure of DNA. Which are correct?

A. 1 and 3 only

B. 1, 2 and 3

C. 2 and 3 only

D. 1 and 2 only

Answer: Option D

Solution (By JKExamLibrary)

Carolus Linnaeus, a Swedish botanist, formalized the system of binomial nomenclature for naming organisms. Louis Pasteur made immense contributions to microbiology, including the development of the first effective vaccine against rabies. Gregor Mendel is the father of genetics, known for his laws of inheritance; the structure of DNA was discovered by Watson and Crick. Thus, statements 1 and 2 are correct.

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Question #1

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A network of interconnected food chains is called a:

A. Food web

B. Trophic level

C. Food pyramid

D. Ecological niche

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Correct Answer: Option A

Explanation:
A food web represents complex feeding relationships in an ecosystem, showing how multiple food chains are linked. Food chain is linear.

This question belongs to: Science Biology

Question #2

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Consider statements about the endoplasmic reticulum: 1. Rough ER has ribosomes attached. 2. Smooth ER synthesizes lipids. 3. Rough ER is involved in detoxification. Which are correct?

A. 2 and 3 only

B. 1, 2 and 3

C. 1 and 2 only

D. 1 and 3 only

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Correct Answer: Option C

Explanation:
The rough endoplasmic reticulum (RER) has ribosomes attached to its cytoplasmic surface, making it appear rough, and is primarily involved in protein synthesis and modification. The smooth endoplasmic reticulum (SER) lacks ribosomes and is the major site for lipid synthesis and detoxification of drugs. Statement 3 is incorrect as detoxification is a function of SER.

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Question #3

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The enzyme that catalyzes the conversion of starch into maltose is:

A. Lipase

B. Amylase

C. Lactase

D. Protease

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Correct Answer: Option B

Explanation:
Amylase (ptyalin in saliva, pancreatic amylase in intestine) hydrolyzes starch (a polysaccharide) into maltose (a disaccharide) and dextrins. Lactase breaks lactose, lipase digests lipids, protease digests proteins. Salivary amylase works at neutral pH, pancreatic amylase in the small intestine. Maltase then breaks maltose into two glucose molecules.

This question belongs to: Science Biology

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