The vitamin that is required for the synthesis of ATP from ADP is:
A. Niacin
B. Pantothenic acid
C. Thiamine
D. Riboflavin
Answer: Option A
Solution (By JKSSB Mock Tests)
Niacin is part of NAD⁺/NADH, which donates electrons to the electron transport chain to generate the proton gradient for ATP synthesis. All B vitamins contribute indirectly.
Explanation:
The tricuspid valve (right atrioventricular valve) has three cusps and closes during ventricular systole to prevent regurgitation into the right atrium. The bicuspid (mitral) is on the left side. Aortic and pulmonary valves are semilunar valves at the ventricular outlets.
Explanation:
Simple columnar epithelium lines the stomach, intestines, and gallbladder, and functions in secretion and absorption. It often has microvilli (brush border) or goblet cells. Squamous epithelium lines alveoli and blood vessels, cuboidal kidney tubules.
Explanation:
The hepatic portal system directs nutrient-rich blood from intestines to liver. Blood pressure is highest in arteries; fish have two-chambered heart; foramen ovale is a fetal structure that closes after birth.
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