Question 1

Which of the following statements correctly distinguishes between a monosaccharide and a disaccharide?

Accepted Answer

A monosaccharide is a single sugar unit, while a disaccharide is composed of two monosaccharides joined by a glycosidic bond.

Question 2

Which of the following best describes the difference between D- and L-glucose?

Accepted Answer

D- and L-glucose are enantiomers, mirror images differing at every chiral center.

Question 3

Which of the following functional groups is present in all monosaccharides?

Accepted Answer

Alcohol

Question 4

Which of the following is an example of a condensation reaction involving carbohydrates?

Accepted Answer

The formation of a glycosidic bond between two monosaccharides, releasing water

Question 5

Which of the following best describes the glycosidic bond in lactose?

Accepted Answer

A $$\beta-1$$,4-glycosidic bond between galactose and glucose

Question 6

Which of the following statements about soluble and insoluble fibers is correct?

Accepted Answer

Soluble fibers dissolve in water and can help lower blood cholesterol, while insoluble fibers do not dissolve in water and aid in digestive health.

Question 7

A patient with blood type O receives a transfusion of type AB blood. What is the most likely outcome?

Accepted Answer

A severe immune reaction, because type O blood contains anti-A and anti-B antibodies.

Question 8

Which of the following best describes the role of heparin in the body?

Accepted Answer

Heparin is a polysaccharide that acts as an anticoagulant, preventing blood clotting.

Question 9

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. If the pressure is increased to 2.0 atm and the temperature is decreased to 150 K, what is the new volume? (Use the combined gas law: $$\frac{P_1$ V_1$}{T_1$} = \frac{P_2$ V_2$}{T_2$})$$

Accepted Answer

$$V_2 = 0.5$$\ \mathrm{L}$$

Question 10

Which of the following compounds would have the highest boiling point?

Accepted Answer

Ethanol ($$\mathrm{CH_3CH_2OH}$$), which can hydrogen bond

Question 11

Which of the following statements best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so the attractive forces between oil and water are weak.

Question 12

Which of the following best describes an amphipathic molecule?

Accepted Answer

A molecule that contains both hydrophilic and hydrophobic regions.

Question 13

Which of the following is a correct statement about the structure of a cell membrane?

Accepted Answer

The cell membrane is composed of a phospholipid bilayer with nonpolar tails facing inward and polar heads facing outward.

Question 14

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

Accepted Answer

Fats have more saturated fatty acids, leading to stronger London dispersion forces and higher melting points.

Question 15

Which of the following is the correct formula for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 16

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

Ammonia ($$\mathrm{NH_3$})$$

Question 17

Which of the following is a correct application of Boyle’s Law?

Accepted Answer

At constant temperature, if the pressure on a gas increases from 1.0 atm to 2.0 atm, the volume will decrease by half.

Question 18

Which of the following best describes the role of an emulsifier in a mixture of oil and water?

Accepted Answer

An emulsifier stabilizes the mixture by surrounding oil droplets with molecules that have both polar and nonpolar regions.

Question 19

Which of the following is a correct statement about the oxidation of an aldose?

Accepted Answer

Oxidation of an aldose converts the aldehyde group to a carboxylic acid.

Carbohydrates and States of Matter: Study Guide for CHEM 102 (Chapters 6 & 7)

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