Question 1

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

Accepted Answer

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

Question 2

Which of the following statements about monosaccharides is correct?

Accepted Answer

Monosaccharides vary in the number of carbon atoms and the arrangement of their functional groups.

Question 3

A hexose and a pentose differ in their molecular formulas. Which of the following correctly represents their formulas?

Accepted Answer

Hexose: $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$; Pentose: $$\mathrm{C}_5\mathrm{H}_{10}\mathrm{O}_5$$

Question 4

Which of the following best describes a glycosidic linkage?

Accepted Answer

A covalent bond formed between two monosaccharides by a dehydration reaction.

Question 5

Which statement correctly compares glycogen, starch, and cellulose?

Accepted Answer

Glycogen stores energy in animals, starch stores energy in plants, and cellulose provides structural support in plant cell walls.

Question 6

Which of the following is NOT a type of lipid?

Accepted Answer

Glycogen

Question 7

A triglyceride is composed of which components?

Accepted Answer

Three fatty acids and one glycerol molecule

Question 8

Which of the following best describes an ester linkage?

Accepted Answer

A covalent bond formed between a carboxyl group and a hydroxyl group, commonly found in lipids.

Question 9

Which of the following statements correctly distinguishes between saturated and unsaturated fats?

Accepted Answer

Unsaturated fats have one or more double bonds in their fatty acid chains, causing kinks that prevent tight packing.

Question 10

Which of the following best describes the structure of a phospholipid?

Accepted Answer

One glycerol, two fatty acids, and one phosphate group

Question 11

When phospholipids are immersed in water, how do they arrange themselves?

Accepted Answer

They form a bilayer with hydrophilic heads facing the water and hydrophobic tails facing inward.

Question 12

Which of the following is a biological role of phospholipids?

Accepted Answer

Structural component of cell membranes

Question 13

Which of the following best describes a steroid?

Accepted Answer

A lipid molecule composed of four fused carbon rings

Question 14

Cholesterol is important in biological membranes because:

Accepted Answer

It increases membrane fluidity at high temperatures and decreases it at low temperatures.

Question 15

Which root word or prefix indicates 'two' in the context of biological molecules?

Accepted Answer

di-

Question 16

Which of the following best describes the term 'amphi-' as used in biology?

Accepted Answer

Refers to both hydrophilic and hydrophobic properties

Question 17

Which of the following is a correct example of a disaccharide formed by a glycosidic linkage?

Accepted Answer

Sucrose formed from glucose and fructose

Question 18

Which of the following is a correct application of the term 'oligosaccharide'?

Accepted Answer

A carbohydrate composed of 2-10 monosaccharide units

Question 19

Which of the following is a real-world example of the biological importance of cellulose?

Accepted Answer

Cellulose provides structural support in plant cell walls, allowing trees to grow tall.

Question 20

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

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails.

Carbohydrates and Lipids: Structure, Function, and Biological Roles

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