Question 1

Which of the following best describes the difference between an aldose and a ketose sugar?

Accepted Answer

An aldose has a carbonyl group at the end of the carbon chain, while a ketose has it in the middle.

Question 2

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

Accepted Answer

$$\mathrm{(CH_2O)_n}$$

Question 3

Which of the following statements about glycosidic linkages is TRUE?

Accepted Answer

They are covalent bonds formed by condensation reactions between two hydroxyl groups.

Question 4

A polysaccharide with extensive branching due to $$\alpha-1$$,6-glycosidic linkages is most likely:

Accepted Answer

Glycogen

Question 5

Which of the following best explains why cellulose is difficult for most animals to digest?

Accepted Answer

Most animals lack enzymes that can hydrolyze $$\beta-1$$,4-glycosidic linkages.

Question 6

Which polysaccharide is a major component of the exoskeletons of insects and the cell walls of fungi?

Accepted Answer

Chitin

Question 7

What is the primary function of peptidoglycan in bacterial cells?

Accepted Answer

It provides structural support to the cell wall.

Question 8

Which of the following best describes the role of glycoproteins on the surface of animal cells?

Accepted Answer

They help cells recognize each other and communicate.

Question 9

During photosynthesis, plants store energy from sunlight in which type of chemical bond?

Accepted Answer

Covalent bonds in carbohydrates

Question 10

Which enzyme is responsible for hydrolyzing glycogen in animal cells to release glucose?

Accepted Answer

Phosphorylase

Question 11

A patient is diagnosed with a digestive disorder that prevents the breakdown of starch. Which enzyme is most likely deficient?

Accepted Answer

Amylase

Question 12

Which of the following is a direct precursor for nucleotide formation in cells?

Accepted Answer

Ribose

Question 13

Which of the following statements about dietary fiber is correct?

Accepted Answer

It consists mainly of carbohydrates that cannot be hydrolyzed by human enzymes.

Question 14

Which of the following best explains why starch and glycogen are efficient energy storage molecules?

Accepted Answer

They have $$\alpha-$$glycosidic linkages that are easily hydrolyzed by enzymes.

Question 15

Which of the following is a distinguishing feature of amylose compared to amylopectin?

Accepted Answer

Amylose is unbranched and contains only $$\alpha-1$$,4-glycosidic linkages.

Question 16

Which of the following best describes the structural difference between cellulose and starch?

Accepted Answer

Cellulose has $$\beta-1$$,4-glycosidic linkages, while starch has $$\alpha-1$$,4-glycosidic linkages.

Question 17

Which of the following is NOT a function of carbohydrates in cells?

Accepted Answer

Catalyzing chemical reactions

Question 18

Which of the following best explains why hydrogen bonds form between parallel strands of cellulose?

Accepted Answer

Every other glucose monomer is flipped, allowing close alignment of strands.

Question 19

Which of the following is a real-world application of glycoproteins in medicine?

Accepted Answer

Blood type determination for safe transfusions

Chapter 5: An Introduction to Carbohydrates – Structure, Function, and Biological Roles

Study Guide - Practice Questions