Consider statements about cell division: 1. Cytokinesis in plant cells occurs by cell plate formation. 2. Meiosis maintains the chromosome number. 3. Mitosis occurs in somatic cells. Which are correct? MCQ with Answer and Explanation

Explanation:
Pepsin, activated from pepsinogen by HCl, initiates protein digestion in the stomach, breaking proteins into smaller peptides. Trypsin and chymotrypsin are pancreatic enzymes active in the small intestine. Carboxypeptidase is also pancreatic. Pepsin is an endopeptidase active at acidic pH.

Explanation:
Spectrin is a cytoskeletal protein that lines the inner surface of the RBC membrane, maintaining its biconcave shape and providing elasticity to squeeze through capillaries. Hemoglobin carries oxygen, myosin is a motor protein, keratin is structural in skin/hair. Defects in spectrin cause spherocytosis.

Explanation:
The renal corpuscle consists of the glomerulus (capillary tuft) and Bowman's capsule. This is where ultrafiltration of blood occurs. The filtrate then passes through the proximal tubule, loop of Henle, distal tubule, and collecting duct. The loop of Henle concentrates urine, the tubules reabsorb and secrete. The nephron is the complete functional unit.