In a food chain, the trophic level with the greatest amount of energy is: MCQ with Answer and Explanation

Explanation:
Adenine (A) pairs with thymine (T) via two hydrogen bonds. Guanine (G) pairs with cytosine (C) via three hydrogen bonds. This base pairing (complementarity) is key to the double helix structure and ensures accurate replication and transcription. The higher number of bonds between G-C contributes to DNA stability; GC-rich regions are harder to denature.

Explanation:
Primase is an RNA polymerase that synthesizes short RNA primers complementary to the DNA template, providing a free 3'-OH for DNA polymerase to begin synthesis. Helicase unwinds, polymerase extends, ligase joins.

Explanation:
The liver is the largest internal organ and gland, weighing about 1.5 kg in an adult. It performs over 500 functions, including bile production, detoxification, metabolism of carbohydrates, lipids, and proteins, and synthesis of plasma proteins. The pancreas and thyroid are smaller glands, the spleen is not a gland.