Question 1

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

Accepted Answer

Its ability to form four stable covalent bonds with other atoms

Question 2

Which of the following bonds is considered nonpolar in organic molecules?

Accepted Answer

$$\mathrm{C-H}$$

Question 3

A molecule with the formula $$\mathrm{C_3H_7OH}$$ can exist as two different compounds with different bonding relationships. What are these compounds called?

Accepted Answer

Structural isomers

Question 4

Which functional group is highlighted in the structure of glycine and is found in all amino acids?

Accepted Answer

Amino group ($$-NH_2$)

Question 5

Which functional group is responsible for the acidic properties of amino acids at physiological pH?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 6

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

Accepted Answer

A ketone has a carbonyl group bonded to two carbons, while an aldehyde has it bonded to one carbon and one hydrogen.

Question 7

Which functional group is nonpolar and can affect gene expression when attached to DNA?

Accepted Answer

Methyl group ($$-CH_3$)

Question 8

Which reaction type is responsible for linking monomers together to form polymers in biological systems?

Accepted Answer

Dehydration reaction

Question 9

Which of the following statements about isomers is correct?

Accepted Answer

Structural isomers have the same atoms but different bonding relationships.

Question 10

Which functional group is capable of forming disulfide bridges in proteins, contributing to protein structure?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 11

Which of the following best explains why nonpolar molecules do not dissolve well in water?

Accepted Answer

Nonpolar molecules are hydrophobic and do not interact favorably with water's polar molecules.

Question 12

Which functional group is weakly acidic, negatively charged at physiological pH, and commonly found in nucleic acids and ATP?

Accepted Answer

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

Question 13

Which of the following is a real-life example of how a small change in functional groups can have a significant biological effect?

Accepted Answer

The difference between estrogen and testosterone

Question 14

Which process breaks down polymers into monomers by adding water?

Accepted Answer

Hydrolysis reaction

Question 15

Which class of biological macromolecules is formed from amino acid monomers?

Accepted Answer

Proteins

Question 16

A molecule with the same molecular formula as another but with a different spatial arrangement of atoms is called a:

Accepted Answer

Stereoisomer

Question 17

Which functional group is polar, forms hydrogen bonds with water, and is found in alcohols?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 18

Which of the following best describes a dehydration reaction?

Accepted Answer

A reaction that removes water to form a new bond

Question 19

Which of the following is NOT a functional group commonly found in biological molecules?

Accepted Answer

Nitride group ($$-N_3$)

Question 20

Which of the following statements about polymers is correct?

Accepted Answer

Polymers are formed by linking monomers through dehydration reactions.

Carbon and Organic Molecules: Structure, Function, and Diversity

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