The antibiotic that inhibits bacterial cell wall synthesis is: MCQ with Answer and Explanation

The antibiotic that inhibits bacterial cell wall synthesis is:
A. Tetracycline
B. Streptomycin
C. Penicillin
D. Chloramphenicol
Answer: Option C
Solution (By JKSSB Mock Tests)
Penicillin and other beta-lactam antibiotics (cephalosporins, carbapenems) inhibit the transpeptidase enzyme involved in cross-linking peptidoglycan, weakening the cell wall and causing bacterial lysis. Tetracycline and streptomycin inhibit protein synthesis by acting on ribosomes. Chloramphenicol also inhibits protein synthesis. Penicillin is most effective against actively dividing gram-positive bacteria.

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Practice More Biology Questions

Question #1
Which of the following is an example of an insectivorous plant?
A. Rhizobium
B. Cuscuta
C. Drosera
D. Monotropa

Correct Answer: Option C


Explanation:
Drosera (sundew) is an insectivorous plant that captures insects with sticky tentacles on leaves to supplement nitrogen in nutrient-poor soils. Cuscuta is a parasitic plant, Monotropa is saprophytic, Rhizobium is a bacterium, not a plant. Insectivorous plants include pitcher plant (Nepenthes), Venus flytrap, and bladderwort. They are autotrophic but supplement nitrogen.

This question belongs to: Science Biology
Question #2
The organism that causes sleeping sickness is transmitted by:
A. Tick
B. Housefly
C. Mosquito
D. Tsetse fly

Correct Answer: Option D


Explanation:
African sleeping sickness (trypanosomiasis) is caused by Trypanosoma brucei and transmitted by the bite of the tsetse fly (Glossina). Malaria is by mosquito, typhoid by housefly (mechanical), Lyme disease by tick.

This question belongs to: Science Biology
Question #3
Which of the following is NOT a characteristic of living organisms?
A. Growth
B. Crystallization
C. Metabolism
D. Reproduction

Correct Answer: Option B


Explanation:
Crystallization is a property of non-living substances where molecules arrange in a definite pattern, e.g., salt crystals. Living organisms exhibit growth, reproduction, metabolism, cellular organization, and consciousness. Metabolism is a defining feature of all living organisms, occurring even in unicellular forms. Reproduction, though absent in sterile organisms like mules, is generally a characteristic. Growth in living beings is internal and intrinsic, unlike extrinsic accumulation in non-living things. Hence, crystallization is not a characteristic of life.

This question belongs to: Science Biology