The smallest bone in the human body is the: MCQ with Answer and Explanation

Explanation:
Human somatic cells are diploid (2n = 46), with 23 pairs of homologous chromosomes. Gametes (sperm and egg) are haploid (n = 23), containing one set of chromosomes. Fertilization restores diploidy. The haploid number is 23. Option 22 would be autosomes plus one sex chromosome, but the total count is 23. 44 is the number of autosomes in somatic cells.

Explanation:
Kidneys are retroperitoneal, not in the abdominal cavity proper. They produce renin, and filter ~180 L/day (GFR ~125 mL/min). So 1 is incorrect.

Explanation:
Saccharomyces cerevisiae (baker's yeast) ferments sugars to ethanol and CO₂, a process used in biofuel production, brewing, and baking. Lactobacillus produces lactic acid, Aspergillus oryzae is used in soy sauce and sake fermentation, Rhizopus is a mold causing bread spoilage. Yeast can utilize various feedstocks like corn, sugarcane.