Which pathogen causes tuberculosis in humans? MCQ with Answer and Explanation

Which pathogen causes tuberculosis in humans?
A. Salmonella typhi
B. Plasmodium vivax
C. Streptococcus pneumoniae
D. Mycobacterium tuberculosis
Answer: Option D
Solution (By JKSSB Mock Tests)
Tuberculosis (TB) is a bacterial infection caused by Mycobacterium tuberculosis, typically affecting the lungs. It is spread through airborne droplets. S. pneumoniae causes pneumonia, S. typhi typhoid, P. vivax malaria. TB is treated with a multi-drug regimen including isoniazid and rifampicin.

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Practice More Biology Questions

Question #1
In molecular biology, the 'Wobble hypothesis' explains the flexibility in base pairing between the:
A. Second base of the codon and the second base of the anticodon
B. First base of the codon and the first base of the anticodon
C. DNA template and the newly synthesized mRNA
D. Third base of the codon and the first base of the anticodon

Correct Answer: Option D


Explanation:
The Wobble hypothesis, proposed by Francis Crick, explains the degeneracy of the genetic code. It states that the base pairing rules (A-U, G-C) are strictly followed for the first two bases of the mRNA codon, but the third base of the codon (the 3' end) can form non-standard or 'wobble' base pairs with the first base of the tRNA anticodon (the 5' end). This allows a single tRNA molecule to recognize and bind to more than one synonymous codon.

This question belongs to: Science Biology
Question #2
The edible part of a potato is a modified:
A. Root
B. Stem
C. Leaf
D. Flower

Correct Answer: Option B


Explanation:
The potato is a modified underground stem known as a tuber. It stores food (starch) and has 'eyes' which are actually axillary buds capable of growing into new plants. This distinguishes it from modified roots like sweet potatoes, which do not possess nodes, internodes, or buds.

This question belongs to: Science Biology
Question #3
Identify the correct statement about mutations:
A. All mutations are caused by radiation.
B. Mutations cannot be spontaneous.
C. Mutations can be inherited if they occur in germ cells.
D. Silent mutations always change the protein sequence.

Correct Answer: Option C


Explanation:
Germline mutations can be passed to offspring. Mutations can be spontaneous or induced; silent mutations do not change the amino acid sequence.

This question belongs to: Science Biology