Question 1

Which property of carbon allows it to form such a wide variety of organic molecules essential for life?

Accepted Answer

Its four valence electrons, allowing it to form up to four covalent bonds

Question 2

Which of the following hydrocarbons contains a double bond in its carbon skeleton?

Accepted Answer

C2H4

Question 3

Why are hydrocarbons generally insoluble in water?

Accepted Answer

The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.

Question 4

Which functional group is responsible for the acidic properties of acetic acid?

Accepted Answer

Carboxyl group

Question 5

A molecule with the formula $$C_6H_{12}O_6$ can exist as different isomers. Which type of isomerism is responsible for glucose and fructose having the same formula but different structures?

Accepted Answer

Structural isomerism

Question 6

Which functional group is found in all amino acids and acts as a base?

Accepted Answer

Amino group

Question 7

Which of the following best explains why silicon, despite having four valence electrons, is not the backbone of life like carbon?

Accepted Answer

Silicon forms weaker and less diverse bonds compared to carbon.

Question 8

Which functional group is highlighted in the following structure: $$CH_3$$-$$CH_2-OH$?

Accepted Answer

Hydroxyl group

Question 9

Which of the following statements about enantiomers is TRUE?

Accepted Answer

They are mirror images that cannot be superimposed.

Question 10

A pharmaceutical company discovers that only one enantiomer of a drug is effective. What is the most likely explanation for this observation?

Accepted Answer

Biological systems are sensitive to molecular shape and only one enantiomer fits the target site.

Question 11

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They influence the chemical reactivity and shape of the molecule.

Question 12

Which functional group is most likely to be found in a molecule that can transfer energy, such as ATP?

Accepted Answer

Phosphate group

Question 13

Which of the following is NOT a way that carbon skeletons can vary to create molecular diversity?

Accepted Answer

Type of ionic bonds formed

Question 14

Which of the following best explains why fats are a good energy source?

Accepted Answer

They contain long hydrocarbon chains that release energy when oxidized.

Question 15

Which functional group is responsible for forming disulfide bridges that stabilize protein structure?

Accepted Answer

Sulfhydryl group

Question 16

A molecule contains both a carbonyl group and several hydroxyl groups. Which type of molecule is this most likely to be?

Accepted Answer

A sugar

Question 17

Which of the following is a correct Lewis dot structure for a carbon atom?

Accepted Answer

A central 'C' with four single dots around it

Question 18

Which of the following best describes a structural isomer?

Accepted Answer

Molecules with the same molecular formula but different covalent arrangements of atoms

Question 19

Which functional group, when added to DNA, can affect gene expression?

Accepted Answer

Methyl group

Question 20

How many functional groups are considered most important in the chemistry of life, according to your study materials?

Accepted Answer

7

Chapter 4: Carbon and the Molecular Diversity of Life

Study Guide - Practice Questions

Study Guide - Flashcards