Question 1

Which of the following best describes an isoprenoid?

Accepted Answer

A lipid constructed from two or more isoprene units with the same carbon skeleton or rearranged forms.

Question 2

What is the molecular formula for an isoprene unit?

Accepted Answer

$C_5H_8$

Question 3

Which of the following is a correct example of a terpene?

Accepted Answer

A molecule constructed from multiple isoprene units joined head-to-tail.

Question 4

How many isoprene units are present in a molecule of squalene ($C_{30}H_{50}$)?

Accepted Answer

6

Question 5

Which of the following statements about terpenoids is TRUE?

Accepted Answer

Terpenoids are modified terpenes that contain additional functional groups, often containing oxygen.

Question 6

A molecule is constructed from three isoprene units. What is the general formula for this molecule?

Accepted Answer

$C_{15}H_{24}$

Question 7

Which of the following best describes the difference between a terpene and a terpenoid?

Accepted Answer

Terpenoids contain additional functional groups, while terpenes are hydrocarbons.

Question 8

Which of the following is NOT a function of isoprenoids in biological systems?

Accepted Answer

Catalyzing peptide bond formation during translation.

Question 9

A certain natural product is classified as a diterpene. How many isoprene units does it contain?

Accepted Answer

4

Question 10

Which of the following best explains why isoprenoids are considered lipids?

Accepted Answer

They are hydrophobic molecules constructed from isoprene units.

Question 11

Which of the following is a correct head-to-tail linkage of isoprene units?

Accepted Answer

The 1-position of one isoprene unit joins to the 4-position of another.

Question 12

Which of the following molecules is NOT derived from isoprene units?

Accepted Answer

Cellulose

Question 13

A molecule with the formula $C_{20}H_{32}$ is most likely a:

Accepted Answer

Diterpene

Question 14

Which of the following best describes the biosynthetic origin of terpenoids?

Accepted Answer

They are derived from the polymerization and modification of isoprene units.

Question 15

Which of the following is a real-life application of isoprenoids?

Accepted Answer

They are used as essential oils in perfumes and flavorings.

Isoprenoids, Terpenes, and Terpenoids: Structure and Classification

Study Guide - Practice Questions