Color blindness is an example of which type of inheritance? MCQ with Answer and Explanation

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Color blindness is an example of which type of inheritance?

A. Autosomal dominant

B. X-linked recessive

C. Y-linked

D. Autosomal recessive

Answer: Option B

Solution (By JKExamLibrary)

Color blindness (specifically red-green color blindness) is an X-linked recessive disorder. The gene responsible is located on the X chromosome. Males (XY) are more frequently affected because they only have one X chromosome; a single recessive allele will cause the disorder. Females (XX) need two recessive alleles to be affected, making them more likely to be carriers.

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Question #1

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Assertion (A): The bacterial cell wall is composed of peptidoglycan.
Reason (R): Peptidoglycan provides structural strength and prevents osmotic lysis.

A. Both A and R are true, but R is not the correct explanation.

B. A false, R true.

C. A true, R false.

D. Both A and R are true, and R is the correct explanation.

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Correct Answer: Option D

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 #2

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The process of separating proteins based on their net charge is:

A. SDS-PAGE

B. Ion exchange chromatography

C. Gel filtration chromatography

D. Affinity chromatography

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Correct Answer: Option B

Explanation:
Ion exchange chromatography separates proteins based on their net surface charge; positively charged proteins bind to cation exchangers, negatively to anion exchangers. Gel filtration separates by size, affinity by specific binding, SDS-PAGE by molecular weight.

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Question #3

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Consider statements about human anatomy: 1. The heart pumps blood throughout the body. 2. The lungs exchange oxygen and carbon dioxide. 3. The kidneys produce urine. Which are correct?

A. 1, 2 and 3

B. 1 and 2 only

C. 2 and 3 only

D. 1 and 3 only

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Correct Answer: Option A

Explanation:
The heart is a muscular pump that circulates blood through the cardiovascular system, delivering oxygen and nutrients to tissues and removing waste. The lungs are the primary organs of the respiratory system, where gas exchange occurs: oxygen diffuses from the alveoli into the blood, and carbon dioxide diffuses from the blood into the alveoli to be exhaled. The kidneys are the primary excretory organs, filtering blood to remove metabolic waste, excess water, and ions, producing urine. All statements are correct.

This question belongs to: Science Biology

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