Question 1

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is a positively charged ion, while an anion is negatively charged.

Question 2

Which property of water allows it to move upward through the stem of a plant against gravity?

Accepted Answer

Adhesion

Question 3

Organic molecules are primarily composed of which element, and what property makes this element ideal for forming large, complex molecules?

Accepted Answer

Carbon; its ability to form four covalent bonds.

Question 4

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has an uneven distribution of charge due to differences in electronegativity between hydrogen and oxygen.

Question 5

A student mixes table salt (NaCl) in water. Which type of bond is broken when NaCl dissolves, and what type of interaction forms between the ions and water molecules?

Accepted Answer

Ionic bonds are broken; ion-dipole interactions form.

Question 6

Which of the following is the correct chemical formula for a carboxyl group?

Accepted Answer

$$\mathrm{COOH}$$

Question 7

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

Accepted Answer

A carbohydrate

Question 8

Which of the following best describes the process of adhesion in biological systems?

Accepted Answer

The attraction between molecules of different substances.

Question 9

If a solution has a pH of 8, which of the following statements is true?

Accepted Answer

The solution is basic and has a higher concentration of $$\mathrm{OH^-}$$ ions than $$\mathrm{H^+}$$ ions.

Question 10

Which functional group is found in aldehydes and is represented by the formula $$\mathrm{CHO}$$?

Accepted Answer

Carbonyl group

Question 11

A molecule with the formula $$\mathrm{C_6H_{12}O_6$} is $$most likely which type of biological molecule?

Accepted Answer

A monosaccharide

Question 12

Which of the following best explains why ionic compounds like NaCl dissolve readily in water?

Accepted Answer

Water is polar and stabilizes the separated ions through ion-dipole interactions.

Question 13

Which of the following is a correct statement about organic compounds?

Accepted Answer

They are defined by the presence of carbon atoms bonded to hydrogen.

Question 14

A student is studying the structure of glucose. Which functional groups are present in glucose?

Accepted Answer

Hydroxyl and carbonyl groups

Question 15

Which of the following best describes the role of hydrogen bonds in the properties of water?

Accepted Answer

They enable water to have a high specific heat and surface tension.

Question 16

Which of the following is the correct formula for an aldehyde group?

Accepted Answer

$$\mathrm{CHO}$$

Question 17

A solution contains a high concentration of $$\mathrm{H^+}$$ ions. What is the likely pH of this solution?

Accepted Answer

Less than 7

Question 18

Which of the following best explains the concept of cohesion in water?

Accepted Answer

Water molecules stick to each other due to hydrogen bonding.

Question 19

Which of the following is a real-world example of adhesion?

Accepted Answer

Water climbing up a paper towel when it touches a spill.

Question 20

Which of the following best describes the relationship between pH and the concentration of $$\mathrm{H^+}$$ ions in a solution?

Accepted Answer

As pH decreases, the concentration of $$\mathrm{H^+}$$ ions increases.

Fundamental Concepts in General Biology: Atoms, Molecules, and Chemical Bonds

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