The plant cell wall is mainly composed of: MCQ with Answer and Explanation

Explanation:
Light reactions occur in the thylakoid membranes, where photosystems I and II, electron transport chains, and ATP synthase are located. Light energy is captured to produce ATP and NADPH and split water. The Calvin cycle (light-independent) occurs in the stroma.

Explanation:
In aerobic respiration, oxygen accepts electrons at the end of the ETC, forming water. Without it, the chain would halt. This directly explains why oxygen is required.

Explanation:
While restriction enzymes were first observed by Linn and Arber, the first Type II restriction endonuclease (HindII), which is the type used in genetic engineering because it cuts at specific recognition sites, was isolated and characterized by Hamilton O. Smith, Kent W. Wilcox, and Thomas J. Kelly in 1970 from Haemophilus influenzae. For this discovery, Smith shared the Nobel Prize in Physiology or Medicine in 1978. Kary Mullis invented PCR.