The disease that is caused by a deficiency of niacin is: MCQ with Answer and Explanation

Explanation:
Howard Temin and David Baltimore independently discovered reverse transcriptase in retroviruses in 1970, an enzyme that synthesizes DNA from RNA. Watson and Crick DNA structure, Mullis PCR.

Explanation:
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.

Explanation:
The corpus luteum, formed from the ruptured follicle after ovulation, secretes progesterone (and some estrogen) which prepares the endometrium for implantation and maintains early pregnancy until the placenta takes over (around 8-10 weeks). hCG, produced by the placenta, maintains the corpus luteum. Progesterone is crucial for maintaining the uterine lining.