The process of obtaining a large number of identical copies of a gene or organism is: MCQ with Answer and Explanation

Explanation:
The plant cell wall is primarily made up of cellulose, hemicellulose, pectins, and proteins. Cellulose provides the main structural framework, while hemicellulose and pectins help in cross-linking and providing flexibility. Chitin is found in fungal cell walls, and peptidoglycan is found in bacterial cell walls.

Explanation:
Saccharomyces cerevisiae (baker's yeast) ferments sugars, producing CO₂ that leavens dough. Alcohol evaporates during baking.

Explanation:
Alveoli have a rich capillary network for O₂/CO₂ exchange. Inhalation is active (diaphragm contracts), trachea divides into two bronchi (not bronchioles).