The hormone that stimulates the conversion of glycogen to glucose in the liver is:
A. Thyroxine
B. Glucagon
C. Insulin
D. Somatostatin
Answer: Option B
Solution (By JKSSB Mock Tests)
Glucagon, secreted by alpha cells of the pancreas when blood glucose is low, binds to liver receptors activating glycogenolysis (glycogen → glucose) and gluconeogenesis. Insulin promotes glycogenesis (glucose → glycogen). Thyroxine affects metabolism, somatostatin inhibits both insulin and glucagon.
Explanation:
Jonas Salk developed the inactivated polio vaccine (IPV) in 1955, which was the first effective vaccine. Albert Sabin later developed the oral polio vaccine (OPV). Pasteur rabies, Jenner smallpox.
Explanation:
According to Chargaff's rule, A = T and G = C. If A = 30%, then T = 30%. The total for A+T is 60%. The remaining 40% is G+C, so G = 20% and C = 20%. This base pairing is due to specific hydrogen bonding: A-T (2 bonds), G-C (3 bonds). This question applies the concept of base composition.
Explanation:
Penicillin targets the transpeptidase enzyme, blocking peptidoglycan cross-linking, leading to cell lysis. This is the mechanism, so R correctly explains A.
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