Question 1

Which of the following best describes the general formula for a monosaccharide?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n}\mathrm{O}_n$$

Question 2

Which type of glycosidic bond is found in cellulose, and what is its significance for the structure?

Accepted Answer

Cellulose contains $$\beta-1$$,4 glycosidic bonds, which allow parallel chains to form hydrogen bonds, resulting in strong fibrils.

Question 3

Which of the following statements about the structure of glucose in aqueous solution is correct?

Accepted Answer

Glucose predominantly exists in a ring form because the ring structure is more stable in water.

Question 4

Which of the following best explains why glycogen is more compact than starch?

Accepted Answer

Glycogen is highly branched due to frequent $$\alpha-1$$,6 glycosidic bonds, allowing for more compact storage.

Question 5

A patient is diagnosed with a deficiency in the enzyme that breaks $$\beta-1$$,4 glycosidic bonds. Which dietary component will be most difficult for them to digest?

Accepted Answer

Cellulose

Question 6

Which of the following is a correct description of a disaccharide?

Accepted Answer

A molecule formed by two monosaccharides joined by a glycosidic bond, such as sucrose.

Question 7

Which of the following best describes the difference between ribose and deoxyribose?

Accepted Answer

Ribose has a hydroxyl group at the 2' carbon, while deoxyribose has a hydrogen.

Question 8

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are not polymers and do not have a common structure.

Question 9

Which of the following best explains why vegetable oils are liquid at room temperature while animal fats are solid?

Accepted Answer

Vegetable oils contain more unsaturated fatty acids with cis double bonds, increasing fluidity and lowering melting point.

Question 10

Which of the following is a real-life consequence of the hydrophobic effect in biological membranes?

Accepted Answer

Phospholipids spontaneously form bilayers in aqueous solutions, creating cell membranes.

Question 11

A triglyceride is formed by which type of reaction?

Accepted Answer

Condensation reaction forming ester linkages between glycerol and three fatty acids.

Question 12

Which of the following statements about fatty acids is correct?

Accepted Answer

Saturated fatty acids have only single bonds between carbons, resulting in straight chains.

Question 13

Which of the following is a function of steroids in biological systems?

Accepted Answer

Steroids function as hormones and vitamins.

Question 14

Which of the following modifications of carbohydrates is important for energy metabolism?

Accepted Answer

Addition of phosphate groups to form sugar phosphates.

Question 15

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

They have a hydrophilic head and a hydrophobic tail.

Question 16

Which of the following is a consequence of increasing the chain length of fatty acids in a lipid?

Accepted Answer

Fluidity decreases and melting point increases.

Question 17

Which of the following is a correct pairing of a carbohydrate polymer and its biological role?

Accepted Answer

Glycogen – energy storage in animals

Question 18

Which of the following best explains why trans fats are considered unhealthy compared to cis fats?

Accepted Answer

Trans fats have straight chains that pack tightly, raising melting point and contributing to artery blockage.

Question 19

Which of the following is a real-life application of the structural properties of cellulose?

Accepted Answer

Cellulose provides rigidity to plant cell walls, allowing plants to stand upright.

Carbohydrates and Lipids: Structure, Classification, and Biological Roles

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