Question 1

Which of the following elements is the most abundant in living systems, excluding water?

Accepted Answer

Carbon

Question 2

Organic molecules are defined as chemical compounds that contain which of the following?

Accepted Answer

Carbon and Hydrogen

Question 3

Which of the following is NOT a primary class of biomolecules essential for living organisms?

Accepted Answer

Minerals

Question 4

What is the general chemical formula for simple carbohydrates (monosaccharides)?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 5

Which type of chemical reaction links monomers together to form polymers?

Accepted Answer

Dehydration synthesis

Question 6

Which functional group is commonly found in amino acids and is responsible for their basic properties?

Accepted Answer

Amino group ($$-NH_2$)

Question 7

Which of the following statements about dehydration reactions and hydrolysis is correct?

Accepted Answer

Dehydration reactions create polymers from monomers; hydrolysis reactions break down polymers.

Question 8

Which polysaccharide is an important component in the exoskeletons of insects and crustaceans?

Accepted Answer

Chitin

Question 9

What type of covalent bond links monosaccharides together in polysaccharides?

Accepted Answer

Glycosidic bond

Question 10

Which of the following chemical reactions results in energy release when glycosidic bonds are broken?

Accepted Answer

Hydrolysis reaction

Question 11

Which functional group is NOT present in the molecule shown below?

$$\begin{array}{c}
	ext{O} \
|| \
	ext{C} - 	ext{OH} \
| \
	ext{NH}_2
\end{array}$$

Accepted Answer

Sulfhydryl

Question 12

Which of the following is a correct example of a monomer-polymer relationship?

Accepted Answer

Amino acid : Protein

Question 13

Which class of biomolecules is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 14

Which of the following is a function of polysaccharides in plants?

Accepted Answer

Energy storage as starch

Question 15

Which of the following is NOT a function of carbohydrates in living organisms?

Accepted Answer

Catalyzing chemical reactions

Question 16

Which of the following best describes the process of hydrolysis?

Accepted Answer

Breaking down polymers into monomers by adding water

Question 17

Which of the following functional groups is commonly found in nucleic acids and is involved in energy transfer?

Accepted Answer

Phosphate group ($$-PO_4$)

Question 18

Which of the following statements about the structure of carbohydrates is correct?

Accepted Answer

Monosaccharides are single sugar units; polysaccharides are long chains of monosaccharides.

Question 19

Which of the following is the storage form of glucose in animals?

Accepted Answer

Glycogen

Question 20

Which of the following best explains why carbon is an excellent building block for organic molecules?

Accepted Answer

It can form up to four covalent bonds, allowing for diverse molecular structures.

Organic Molecules and Carbohydrates: Structure, Function, and Biological Importance

Study Guide - Practice Questions