The genetic material in humans is organized as: MCQ with Answer and Explanation

The genetic material in humans is organized as:
A. Multiple linear chromosomes in the nucleus
B. RNA molecules
C. A single circular chromosome
D. Only mitochondrial DNA
Answer: Option A
Solution (By JKExamLibrary)
Human cells have 46 linear chromosomes in the nucleus (22 pairs of autosomes and one pair of sex chromosomes), made of DNA and histone proteins. Mitochondria also contain small circular DNA. Prokaryotes have a single circular chromosome. RNA is not the primary genetic material in humans.

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Practice More Biology Questions

Question #1
The condition caused by the accumulation of uric acid crystals in joints is:
A. Rheumatoid arthritis
B. Osteoporosis
C. Gout
D. Osteoarthritis

Correct Answer: Option C


Explanation:
Gout is a form of arthritis resulting from hyperuricemia and deposition of monosodium urate crystals in joints, causing intense pain and inflammation. It is often diet-related. Rheumatoid arthritis is autoimmune, osteoarthritis is degenerative, osteoporosis is loss of bone mass.

This question belongs to: Science Biology
Question #2
The bacterium used in the production of acetic acid (vinegar) is:
A. Acetobacter aceti
B. Streptomyces
C. Lactobacillus
D. Escherichia coli

Correct Answer: Option A


Explanation:
Acetobacter aceti oxidizes ethanol to acetic acid under aerobic conditions, used in vinegar production. Lactobacillus produces lactic acid, Streptomyces produces antibiotics, E. coli is used in genetic engineering but not vinegar.

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Question #3
Ozone layer depletion in the stratosphere is primarily caused by:
A. Chlorofluorocarbons (CFCs)
B. Sulfur dioxide
C. Methane
D. Carbon dioxide

Correct Answer: Option A


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The ozone layer in the stratosphere protects Earth from harmful ultraviolet (UV) radiation. Its depletion is primarily caused by Chlorofluorocarbons (CFCs), which were widely used in refrigerants, aerosols, and solvents. UV radiation breaks down CFCs, releasing chlorine atoms that catalytically destroy ozone molecules. The Montreal Protocol (1987) was an international treaty to phase out the production of CFCs.

This question belongs to: Science Biology