Food Chemistry & Biochemistry MCQs (Quiz 11)

1. Freezing preserves food mainly by _______

 Promoting oxidation

 Enhancing microbial growth

 Slowing microbial and enzymatic activity

 Increasing enzyme activity

2. The primary structure of a protein is determined by its _______

 Amino acid sequence

 Three-dimensional folding

 Disulfide bridges

 Hydrogen bonding pattern

3. Gastric juice in the stomach is highly acidic mainly due to the presence of _______

 Hydrochloric acid

 Pepsin

 Sodium bicarbonate

 Bile salts

4. Maltose, the main fermentable sugar in beer brewing, is produced from starch by the action of which enzyme __________

 Lactase

 Glucoamylase

 β-amylase

 α-amylase

5. Fermentation in beer production, which converts sugars into ethanol and carbon dioxide, is primarily carried out by _______

 Bacteria

 Yeasts

 Algae

 Molds

6. The alcohol produced during beer fermentation is mainly _______

 Propanol

 Ethanol

 Butanol

 Methanol

7. Coenzymes are commonly derived from ___________

 Lipids

 Vitamins

 Minerals

 Pigments

8. Which of the following nutrients is primarily used by cells for the extraction of energy through metabolic pathways such as glycolysis and cellular respiration?

 Vitamin K

 Glucose

 Calcium

 Iron

9. Lipase enzymes catalyze the breakdown of _______

 Nucleic acids

 Proteins

 Polysaccharides

 Triglycerides

10. A key difference between Vitamin E and Vitamin C, in the context of their antioxidant function, is that _______

 Vitamin E is water-soluble, while Vitamin C is fat-soluble

 Vitamin C regenerates oxidized Vitamin E, allowing it to continue protecting cell membranes

 Both vitamins function as co-enzymes in the same metabolic pathway

 Vitamin E acts primarily in the bloodstream, while Vitamin C acts inside mitochondria

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