Which of the following is an example of a viral disease? MCQ with Answer and Explanation

Question
Which of the following is an example of a viral disease?
A. Cholera
B. Diphtheria
C. Leprosy
D. Dengue
Answer: Option D
Solution (By JKExamLibrary)
Dengue fever is caused by the dengue virus (flavivirus) transmitted by Aedes aegypti mosquito. Cholera is bacterial (Vibrio cholerae), diphtheria bacterial (Corynebacterium diphtheriae), leprosy bacterial (Mycobacterium leprae). Viral diseases include influenza, common cold, AIDS, COVID-19, hepatitis, polio, and rabies. Dengue symptoms include high fever, severe headache, joint pain, and rash.
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Practice More Biology Questions

Question #1
The enzyme that unwinds the DNA double helix during replication is:
A. DNA polymerase
B. Ligase
C. Helicase
D. Topoisomerase
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Correct Answer: Option C

Explanation:
Helicase uses ATP to separate the hydrogen-bonded base pairs, creating the replication fork. Topoisomerase relieves supercoiling ahead of the fork. DNA polymerase synthesizes new DNA, ligase joins fragments. Helicase is essential for strand separation and replication initiation.
This question belongs to: Science Biology
Question #2
The organism that causes ringworm in humans belongs to which group?
A. Virus
B. Fungi
C. Protozoa
D. Bacteria
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Correct Answer: Option B

Explanation:
Ringworm (tinea) is a superficial fungal infection caused by dermatophytes (genera Trichophyton, Microsporum, Epidermophyton) that infect skin, hair, and nails. It is not a worm. Bacterial skin infections include impetigo, viral include warts, protozoan include leishmaniasis. Fungi are treated with antifungal agents.
This question belongs to: Science Biology
Question #3
The enzyme that cuts DNA at specific sequences is:
A. Polymerase
B. Helicase
C. Ligase
D. Restriction endonuclease
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Correct Answer: Option D

Explanation:
Restriction enzymes recognize specific palindromic sequences and cleave the DNA backbone, producing sticky or blunt ends for cloning.
This question belongs to: Science Biology
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