Question 1

Which functional group is responsible for the acidic properties of acetic acid, and what is its ionized form in cells?

Accepted Answer

Carboxyl group; $$\mathrm{COO^-}$$

Question 2

A molecule with the formula $$\mathrm{C_6H_{12}O_6$} is $$classified as which type of macromolecule, and what functional groups does it contain?

Accepted Answer

Carbohydrate; carbonyl and hydroxyl groups

Question 3

Which property of water allows a spider to walk on its surface, and what is the molecular explanation for this property?

Accepted Answer

Surface tension; hydrogen bonds between water molecules resist external force

Question 4

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

Accepted Answer

A ketone has a carbonyl group within the carbon skeleton, while an aldehyde has it at the end.

Question 5

Which type of chemical bond is primarily responsible for the secondary structure of proteins, and what is the nature of this bond?

Accepted Answer

Hydrogen bond; attraction between partial charges on backbone atoms

Question 6

Which of the following statements about phospholipids is correct?

Accepted Answer

They are the main component of cell membranes due to their amphipathic nature.

Question 7

A scientist observes that ice floats on liquid water. Which property of water explains this phenomenon?

Accepted Answer

Solid water is less dense than liquid water due to hydrogen bonding.

Question 8

Which of the following best explains why table salt (NaCl) dissolves readily in water?

Accepted Answer

Water's partial charges interact with the charged ions, separating them.

Question 9

Which of the following is a correct example of inductive reasoning in biology?

Accepted Answer

Observing that all swans you have seen are white and concluding that all swans are white.

Question 10

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

$$\mathrm{DNA \rightarrow RNA \rightarrow Protein}$$

Question 11

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

Accepted Answer

Amino group ($$\mathrm{NH_2$})$$

Question 12

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

Accepted Answer

They are repelled by water's partial charges and aggregate together.

Question 13

Which of the following is a real-life example of dehydration synthesis?

Accepted Answer

Forming a peptide bond between two amino acids, releasing $$\mathrm{H_2O}$$

Question 14

Which of the following is a property of the methyl group ($$\mathrm{CH_3$}) in $$biological molecules?

Accepted Answer

It affects gene expression and the shape of sex hormones.

Question 15

Which of the following best describes the role of valence electrons in chemical bonding?

Accepted Answer

They are the outermost electrons and determine how atoms bond.

Question 16

Which of the following is a correct statement about the structure and function relationship in biology?

Accepted Answer

The structure of a protein determines its function.

Question 17

Which of the following is a unifying theme in biology that explains the diversity and unity of life?

Accepted Answer

Evolution by natural selection

Question 18

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a membrane-bound nucleus, prokaryotic cells do not.

Question 19

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between oxygen and hydrogen in a water molecule

The Chemical Context of Life: Functional Groups and Biological Macromolecules

Study Guide - Practice Questions