Food Chemistry & Biochemistry MCQs (Quiz 11)

1. Lipase enzymes catalyze the breakdown of _______

 Triglycerides

 Nucleic acids

 Polysaccharides

 Proteins

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

 Disulfide bridges

 Three-dimensional folding

 Amino acid sequence

 Hydrogen bonding pattern

3. Freezing preserves food mainly by _______

 Enhancing microbial growth

 Increasing enzyme activity

 Promoting oxidation

 Slowing microbial and enzymatic activity

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

 β-amylase

 Glucoamylase

 α-amylase

 Lactase

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

 Yeasts

 Algae

 Molds

 Bacteria

6. The alcohol produced during beer fermentation is mainly _______

 Methanol

 Ethanol

 Propanol

 Butanol

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

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

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

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

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

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

 Bile salts

 Hydrochloric acid

 Pepsin

 Sodium bicarbonate

9. Coenzymes are commonly derived from ___________

 Lipids

 Pigments

 Minerals

 Vitamins

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

 Iron

 Calcium

 Glucose

 Vitamin K

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