Food Chemistry & Biochemistry MCQs (Quiz 10)

1. In humans, Vitamin A is important for maintaining _______

 Protein digestion

 Muscle contraction

 Bone marrow clotting

 Normal vision and epithelial tissues

2. Oxidative rancidity mainly results from the _______

 Denaturation of proteins

 Hydrolysis of starch

 Fermentation of sugars

 Oxidation of unsaturated fatty acids

3. Among the digestive juices_____________  has an almost neutral pH (approximately pH 7.0 to 8.0)

 Gastric juice

 Pancreatic juice

 None

 Bile juice

4. Denaturation of proteins causes loss of __________

 Biological activity

 Primary structure

 Amino acids

 Peptide bonds

5. The bitter taste in beer mainly comes from compounds derived from _______

 Hops

 Fermentation acids

 Barley starch

 Yeast proteins

6. β-Amylase, an enzyme found in plants (e.g., germinating seeds) and some microorganisms, mainly produces _______

 Galactose

 Maltose

 Lactic acid

 Fructose

7. Collagen is the major structural protein found in _______

 Lymph fluid

 Bile juice

 Connective tissues

 Blood plasma

8. α-Amylase, an enzyme secreted by the salivary glands and pancreas, primarily hydrolyzes _______

 Cellulose into glucose

 Starch into shorter polysaccharides

 Proteins into amino acids

 Lipids into fatty acids

9. Polyphenol oxidase (PPO), an enzyme found in many fruits and vegetables, is mainly responsible for _______

 Enzymatic browning

 Lipid hydrolysis

 Sugar fermentation

 Protein synthesis

10. Iron (Fe) is an essential mineral that plays a critical role in the synthesis of _________________

 Insulin

 Chlorophyll

 Collagen

 Hemoglobin

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Question 1 of 10

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