The antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit is:
A. Penicillin
B. Cephalosporin
C. Vancomycin
D. Tetracycline
Answer: Option D
Solution (By JKSSB Mock Tests)
Tetracycline binds to the 30S ribosomal subunit, blocking attachment of aminoacyl-tRNA, thus inhibiting protein synthesis. Penicillin and cephalosporins inhibit cell wall synthesis, vancomycin also inhibits cell wall synthesis. Aminoglycosides like streptomycin also target 30S. Protein synthesis inhibitors exploit the difference between bacterial and human ribosomes.
Explanation:
Glycogen is a highly branched polysaccharide of glucose, stored primarily in the liver and muscles. Starch is the plant equivalent. Cellulose is a structural polysaccharide in plants, chitin in arthropods and fungi. Glycogen can be rapidly mobilized to maintain blood glucose.
Explanation:
In the central nervous system, oligodendrocytes wrap axons forming the myelin sheath. In the peripheral nervous system, Schwann cells perform this function.
Explanation:
The epiglottis is a cartilage flap that covers the glottis (laryngeal opening) during swallowing, directing food into the esophagus and protecting the airway. The tongue manipulates food, the uvula prevents nasal regurgitation.
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