Food Chemistry & Biochemistry MCQs (Quiz 10)

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

 Sugar fermentation

 Protein synthesis

 Lipid hydrolysis

 Enzymatic browning

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

 Bile juice

 Pancreatic juice

 Gastric juice

 None

3. Collagen is the major structural protein found in _______

 Lymph fluid

 Blood plasma

 Connective tissues

 Bile juice

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

 Lipids into fatty acids

 Starch into shorter polysaccharides

 Proteins into amino acids

 Cellulose into glucose

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

 Insulin

 Collagen

 Chlorophyll

 Hemoglobin

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

 Fructose

 Lactic acid

 Maltose

 Galactose

7. Denaturation of proteins causes loss of __________

 Peptide bonds

 Amino acids

 Primary structure

 Biological activity

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

 Yeast proteins

 Fermentation acids

 Hops

 Barley starch

9. Oxidative rancidity mainly results from the _______

 Oxidation of unsaturated fatty acids

 Denaturation of proteins

 Fermentation of sugars

 Hydrolysis of starch

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

 Normal vision and epithelial tissues

 Bone marrow clotting

 Protein digestion

 Muscle contraction

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Question 1 of 10

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