Question 1

Which property of carbon most directly explains its ability to form a vast diversity of complex molecules essential for life?

Accepted Answer

It can form up to four covalent bonds with other atoms.

Question 2

Which of the following best describes an organic molecule?

Accepted Answer

A molecule that contains both carbon and hydrogen.

Question 3

A scientist discovers a molecule with the formula $$C_6H_{12}O_6$. Which of the following statements is true about this molecule?

Accepted Answer

It is an organic molecule because it contains both carbon and hydrogen.

Question 4

Which of the following is NOT a property of the hydroxyl functional group ($$-OH$$)?

Accepted Answer

It is non-polar and hydrophobic.

Question 5

Which functional group is responsible for making amino acids basic and is essential for protein building?

Accepted Answer

Amino group ($$-NH_2$)

Question 6

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP contains high-energy phosphate bonds that release energy when hydrolyzed.

Question 7

Which of the following is an example of a structural isomer?

Accepted Answer

Butane and isobutane ($$C_4H_{10}) $$with different carbon skeleton arrangements.

Question 8

A molecule contains a $$-SH$$ group. Which property does this functional group confer to the molecule?

Accepted Answer

Ability to form disulfide bridges, stabilizing protein structure.

Question 9

Which of the following best describes the difference between a ketone and an aldehyde?

Accepted Answer

A ketone has the carbonyl group ($$C=O) $$within the carbon skeleton, while an aldehyde has it at the end.

Question 10

Which functional group is most likely to make a molecule act as an acid by donating a proton ($$H^+) in $$aqueous solution?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 11

A molecule with a long hydrocarbon chain is most likely to be:

Accepted Answer

Hydrophobic and a good source of energy when broken down.

Question 12

Which of the following best explains why estradiol and testosterone, though similar in structure, have very different effects in the body?

Accepted Answer

They differ in the functional groups attached to their carbon skeletons.

Question 13

Which of the following is NOT a property of the methyl group ($$-CH_3$)?

Accepted Answer

It is polar and increases solubility in water.

Question 14

Which functional group is essential for the structure of DNA and is involved in energy transfer reactions?

Accepted Answer

Phosphate group ($$-PO_4$^{2-})$$

Question 15

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule composed only of carbon and hydrogen atoms.

Question 16

Which of the following is a real-world example of the importance of isomers in biology?

Accepted Answer

Thalidomide, where one isomer is therapeutic and the other is teratogenic.

Question 17

A molecule is found to have the following structure: $$H_3C-CH_2$-OH. $$Which functional group does it contain and what property does this confer?

Accepted Answer

Hydroxyl group; increases solubility in water.

Question 18

Which of the following best explains why carbon is considered the 'backbone of life'?

Accepted Answer

It can form stable covalent bonds with up to four other atoms, allowing for complex and diverse molecules.

Question 19

Which of the following functional groups is most likely to be found in a molecule that can act as a base in aqueous solution?

Accepted Answer

Amino group ($$-NH_2$)

Question 20

A molecule with the formula $$C_8H_{18} is $$most likely to be:

Accepted Answer

A hydrocarbon, such as octane, and hydrophobic.

Carbon, Chemical Reactions, and Functional Groups: Foundations of Organic Chemistry in Biology

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