Question 1

Which of the following best describes a monosaccharide?

Accepted Answer

A carbohydrate with a general formula $$C_n(H_2O)_n$$ and is the simplest form of sugar.

Question 2

Which of the following is a key structural difference between an aldose and a ketose monosaccharide?

Accepted Answer

Aldoses have a carbonyl group at the end of the carbon chain, while ketoses have it in the middle.

Question 3

Which carbohydrate is the primary energy storage molecule in animals?

Accepted Answer

Glycogen

Question 4

What type of bond links two monosaccharides to form a disaccharide?

Accepted Answer

O-glycosidic bond

Question 5

Which polysaccharide is a major structural component of plant cell walls?

Accepted Answer

Cellulose

Question 6

Which of the following statements about lipids is TRUE?

Accepted Answer

Lipids are a diverse group of compounds with hydrophobic properties.

Question 7

What is the basic structure of a fatty acid?

Accepted Answer

A long hydrocarbon chain with a terminal carboxyl group ($$-COOH).$$

Question 8

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

Accepted Answer

Structural role in cell membranes

Question 9

Which of the following best explains why unsaturated fatty acids are liquid at room temperature?

Accepted Answer

The 'kinks' from double bonds prevent tight packing.

Question 10

Which of the following is an example of a carbohydrate with a structural role in animals?

Accepted Answer

Chitin

Question 11

Which of the following is a correct description of the Fischer projection for carbohydrates?

Accepted Answer

It is a two-dimensional representation showing the configuration of chiral centers.

Question 12

Which of the following is a correct general formula for carbohydrates?

Accepted Answer

$$C_n(H_2O)_n$$

Question 13

Which of the following is a common misconception about the role of lipids in cells?

Accepted Answer

Lipids are only used for energy storage.

Question 14

Which of the following is a correct statement about the stereochemistry of carbohydrates?

Accepted Answer

Carbohydrates can exist as enantiomers due to chiral centers.

Question 15

Which of the following is a correct description of an oligosaccharide?

Accepted Answer

A carbohydrate composed of 3 to 20 monosaccharide units.

Question 16

Which of the following is a correct statement about the formation of cyclic structures in glucose?

Accepted Answer

Glucose forms a cyclic structure called glucopyranose.

Question 17

Which of the following is a correct statement about the role of cholesterol in cell membranes?

Accepted Answer

Cholesterol stiffens the membrane and affects its fluidity.

Question 18

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

Accepted Answer

A carbohydrate composed of two covalently linked monosaccharides.

Question 19

Which of the following is a correct statement about the biological significance of polysaccharides?

Accepted Answer

Polysaccharides serve as energy stores and structural components in tissues.

Question 20

Which of the following is a correct statement about the amphipathic nature of phospholipids?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions.

Carbohydrates and Lipids: Structure, Properties, and Biological Significance

Study Guide - Practice Questions