Which of the following diseases is caused by a virus? MCQ with Answer and Explanation

Question
Which of the following diseases is caused by a virus?
A. Anthrax
B. Malaria
C. Cholera
D. Measles
Answer: Option D
Solution (By JKSSB Mock Tests)
Measles (rubeola) is a highly contagious viral disease caused by the measles virus (a paramyxovirus), characterized by fever, cough, and a distinctive red rash. Anthrax is bacterial (Bacillus anthracis), malaria is protozoan, cholera is bacterial. Measles can be prevented by the MMR vaccine. It is a leading cause of child mortality in unvaccinated populations.
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Question #1
The element present in the center of the chlorophyll molecule is:
A. Calcium
B. Magnesium
C. Cobalt
D. Iron
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Correct Answer: Option B

Explanation:
Magnesium (Mg²⁺) is the central atom in the porphyrin ring of chlorophyll, crucial for light absorption. Iron is in hemoglobin.
This question belongs to: Science Biology
Question #2
The genetic makeup of an organism is its:
A. Allele
B. Karyotype
C. Phenotype
D. Genotype
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Correct Answer: Option D

Explanation:
Genotype refers to the specific set of genes (allelic constitution) of an individual, e.g., TT, Tt, or tt for a trait. Phenotype is the observable characteristic, karyotype is the chromosome complement, allele is a variant form of a gene. The genotype determines the potential phenotype.
This question belongs to: Science Biology
Question #3
The condition characterized by increased intraocular pressure damaging the optic nerve is:
A. Conjunctivitis
B. Cataract
C. Retinal detachment
D. Glaucoma
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Correct Answer: Option D

Explanation:
Glaucoma is a group of eye diseases that result in damage to the optic nerve, often associated with elevated intraocular pressure. It can lead to permanent vision loss if untreated. Cataract is lens clouding, conjunctivitis inflammation of the conjunctiva, retinal detachment is separation of the retina.
This question belongs to: Science Biology
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