Consider statements about human anatomy: 1. The biceps is a muscle in the arm. 2. The quadriceps is a muscle in the thigh. 3. The diaphragm separates the thorax and abdomen. Which are correct? MCQ with Answer and Explanation

Explanation:
When oxygen is limiting, pyruvate from glycolysis is reduced to lactic acid (lactate) by lactate dehydrogenase, regenerating NAD⁺ to allow glycolysis to continue. In yeast, pyruvate is converted to ethanol and CO₂ (alcoholic fermentation). Muscle cells lack alcohol dehydrogenase.

Explanation:
Ruminants like cows, sheep, and goats have a four-chambered stomach (rumen, reticulum, omasum, abomasum) to digest cellulose via microbial fermentation. Cats and dogs have simple stomachs, pigs are monogastric.

Explanation:
Lactobacillus is a lactic acid bacterium that ferments lactose in milk, producing lactic acid that coagulates proteins to form curd. Saccharomyces cerevisiae (baker's yeast) undergoes anaerobic respiration, producing CO2 gas that causes bread dough to rise. Aspergillus niger, a fungus, is widely used in industrial fermentation for the large-scale production of citric acid. All statements are correct.