The scientist who demonstrated that DNA replication is semi-conservative was: MCQ with Answer and Explanation

Explanation:
Pantothenic acid (vitamin B₅) is a component of coenzyme A (CoA), essential for the Krebs cycle and fatty acid metabolism. Thiamine is TPP, riboflavin FAD, biotin for carboxylation.

Explanation:
George Beadle and Edward Tatum irradiated Neurospora crassa and showed that mutations in specific genes caused defects in specific enzymes, leading to the one gene-one enzyme concept. Watson and Crick discovered DNA structure, Mendel laws of inheritance, Morgan chromosome theory.

Explanation:
Green plants (producers) always occupy the first trophic level in a food chain. Energy flow is unidirectional, moving from the sun to producers and then to consumers, never returning to the sun. Due to the 10% law of energy transfer, the pyramid of energy is always upright and can never be inverted. Thus, statements 1 and 2 are correct.