Question 1

Which of the following best describes a chiral molecule?

Accepted Answer

A molecule that has at least one carbon atom bonded to four different groups

Question 2

Which of the following objects is chiral?

Accepted Answer

A left hand

Question 3

Which statement about enantiomers is correct?

Accepted Answer

They have identical physical properties except for the direction they rotate plane-polarized light

Question 4

Which of the following molecules is achiral?

Accepted Answer

$$\mathrm{CCl_3CH_3}$$

Question 5

Which of the following is the correct molecular formula for glucose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 6

Which of the following statements about D- and L- enantiomers of monosaccharides is true?

Accepted Answer

D-enantiomers have the –OH group on the right of the bottom-most chiral carbon in a Fischer projection

Question 7

Which of the following is a reducing sugar?

Accepted Answer

Maltose

Question 8

What type of glycosidic bond is found in maltose?

Accepted Answer

$$\alpha-1$$,4-glycosidic bond

Question 9

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Cellulose contains $$\beta-1$$,4-glycosidic bonds, which human enzymes cannot hydrolyze

Question 10

Which of the following is the correct balanced equation for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + energy}$$

Question 11

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

Accepted Answer

It produces a sugar acid

Question 12

Which of the following is a correct description of mutarotation?

Accepted Answer

The interconversion between alpha and beta anomers of a monosaccharide in solution

Question 13

Which of the following is a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 14

Which of the following is true about the sweetness of common sugars?

Accepted Answer

Fructose is about twice as sweet as sucrose

Question 15

Which of the following is a correct classification for D-fructose?

Accepted Answer

Ketohexose

Question 16

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

Accepted Answer

A 2D representation where horizontal lines project forward and vertical lines project backward

Question 17

Which of the following is the correct product name when D-glucose is reduced?

Accepted Answer

Glucitol (sorbitol)

Question 18

Which of the following best describes the glycosidic bonds in amylopectin?

Accepted Answer

Both $$\alpha-1$$,4- and $$\alpha-1$$,6-glycosidic bonds

Question 19

Which of the following is a correct statement about sucrose?

Accepted Answer

It contains an $$\alpha,\beta-1$$,2-glycosidic bond

Question 20

Which of the following best explains why only one enantiomer of a drug may be biologically active?

Accepted Answer

Biological receptors are chiral and can distinguish between enantiomers

Unit 6: Carbohydrates – Structure, Chirality, and Biological Importance

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