Cameroon GCE A-Level Food Science & Nutrition Practice Questions - Cameroon General Certificate of Education Advanced Level Food Science and Nutrition (Subject Code 0740) Exam - Cameroon GCE A-Level Food Science & Nutrition Practice Questions - Cameroon General Certificate of Education Advanced Level Food Science and Nutrition (Subject Code 0740) Exam

Question 1

D-glucose and D-galactose are essential hexose monosaccharides utilized in human metabolism. Structurally, how are these two aldohexoses related to each other?

They are structural constitutional isomers with different carbonyl functional groups. They are diastereomeric epimers that differ in configuration specifically at carbon-4 (C-4). They are non-superimposable mirror-image enantiomers of the same molecular formula. They are anomers differing exclusively in the orientation of the hemiacetal hydroxyl group at carbon-1.

Correct Answer:

They are diastereomeric epimers that differ in configuration specifically at carbon-4 (C-4).

Question 2

Why is sucrose classified as a non-reducing disaccharide, whereas maltose and lactose act as reducing sugars?

Sucrose contains a ketone group that cannot be oxidized by mild alkaline copper reagents. Sucrose has an insoluble crystalline lattice that prevents aqueous hydration of its carbonyl carbons. The glycosidic bond in sucrose links the anomeric carbons of both glucose (C-1) and fructose (C-2), leaving no free hemiacetal or hemiketal group. Sucrose undergoes rapid internal mutarotation that permanently blocks ring opening in basic solutions.

Correct Answer:

The glycosidic bond in sucrose links the anomeric carbons of both glucose (C-1) and fructose (C-2), leaving no free hemiacetal or hemiketal group.

Question 3

During the thermal cooking of an aqueous starch suspension, starch granules undergo gelatinization. Which structural event fundamentally drives this transition?

Water penetrates the amorphous regions, causing granule swelling, disruption of hydrogen-bonded crystalline amylopectin lamellae, and leaching of linear amylose. Amylose chains form covalent disulfide cross-links with amylopectin, precipitating a rigid anhydrous gel network. Enzymatic alpha-amylase activity hydrolyzes starch polymers into monomeric D-glucose units at 60°C. Granules lose all bound water and shrink into microcrystalline spherulites through irreversible desolvation.

Correct Answer:

Water penetrates the amorphous regions, causing granule swelling, disruption of hydrogen-bonded crystalline amylopectin lamellae, and leaching of linear amylose.

Question 4

When a gelatinized starch paste or baked bread cools and ages during storage, it frequently develops staling and syneresis. What biochemical mechanism explains this retrogradation process?

Microbial fermentation of starch granules produces organic acids that dissolve the amylose matrix. Hydrolytic rancidity of associated lipids cleaves the glycosidic bonds linking glucose units. Non-enzymatic Maillard browning condenses free glucose with lysine residues to form insoluble melanoidins. Dispersed linear amylose and branched amylopectin chains realign and re-associate via hydrogen bonding into ordered crystalline networks, expelling water.

Correct Answer:

Dispersed linear amylose and branched amylopectin chains realign and re-associate via hydrogen bonding into ordered crystalline networks, expelling water.

Question 5

Which of the following dietary fiber components is classified as a soluble, viscous polysaccharide capable of lowering postprandial blood glucose and serum LDL cholesterol?

Lignin, a complex non-carbohydrate polymer of phenylpropane aromatic subunits. Pectin, a structural heteropolysaccharide composed primarily of alpha-(1,4)-linked D-galacturonic acid units. Cellulose, an unbranched homopolysaccharide of beta-(1,4)-linked D-glucose residues. Suberin, a hydrophobic waxy polymer deposited in plant periderm and root endodermis.

Correct Answer:

Pectin, a structural heteropolysaccharide composed primarily of alpha-(1,4)-linked D-galacturonic acid units.

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Prepare with the Cameroon GCE A-Level Food Science & Nutrition Practice Questions - Cameroon General Certificate of Education Advanced Level Food Science and Nutrition (Subject Code 0740) Exam practice quiz. This question bank includes 100 questions covering food, dietary, acid, human, and physiological. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Cameroon GCE A-Level Food Science & Nutrition Practice Questions - Cameroon General Certificate of Education Advanced Level Food Science and Nutrition (Subject Code 0740) Exam

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Cameroon GCE A-Level Food Science & Nutrition Practice Questions - Cameroon General Certificate of Education Advanced Level Food Science and Nutrition (Subject Code 0740) Exam

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