Q: A scientist is studying the movement of sodium ions across a cell membrane. Which equation best represents the calculation of the concentration gradient for sodium ions?

$\text{Gradient} = [Na^+]_{outside} - [Na^+]_{inside}$

Question 1

Which of the following best explains why sodium readily forms ionic bonds with chlorine to produce table salt (NaCl)?

Accepted Answer

Sodium has one electron in its outer shell, which it easily loses to achieve stability, while chlorine gains that electron to complete its valence shell.

Question 2

Which equation correctly represents the dehydration synthesis reaction that forms a disaccharide from two monosaccharides?

Accepted Answer

$C_6H_{12}O_6 + C_6H_{12}O_6 \rightarrow C_{12}H_{22}O_{11} + H_2O$

Question 3

Which property of water is MOST responsible for its ability to move quickly through plant cell membranes during osmosis?

Accepted Answer

Its polarity, which allows it to interact with membrane proteins and pass through aquaporins

Question 4

A mutation causes a protein to lose its tertiary structure but retain its primary and secondary structures. Which of the following is most likely to be affected?

Accepted Answer

The overall three-dimensional folding and function of the protein

Question 5

Which of the following organelles is found in both prokaryotic and eukaryotic cells and is responsible for protein synthesis?

Accepted Answer

Ribosomes

Question 6

Which of the following best describes the difference between facilitated diffusion and active transport across a cell membrane?

Accepted Answer

Facilitated diffusion moves molecules down their concentration gradient using membrane proteins, while active transport moves molecules against their gradient using energy (ATP).

Question 7

Which functional group is commonly found in carbohydrates and is responsible for their reactivity?

Accepted Answer

Hydroxyl group ($-OH$)

Question 8

Which of the following statements about hydrogen bonds is TRUE?

Accepted Answer

Hydrogen bonds form between the hydrogen atom of one molecule and a highly electronegative atom (such as oxygen or nitrogen) of another molecule.

Question 9

Which of the following best explains why lipids are generally insoluble in water?

Accepted Answer

Lipids are nonpolar molecules and do not interact favorably with water's polar molecules.

Question 10

A scientist is studying the movement of sodium ions across a cell membrane. Which equation best represents the calculation of the concentration gradient for sodium ions?

Accepted Answer

$	ext{Gradient} = [Na^+]_{outside} - [Na^+]_{inside}$

Question 11

Which of the following is a correct statement about the structure of an atom?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit around the nucleus.

Question 12

Which of the following best describes the role of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 13

Which of the following is a peptide bond?

Accepted Answer

A bond between the carboxyl group of one amino acid and the amino group of another amino acid

Question 14

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells do not.

Question 15

Which of the following best explains why water has a high surface tension?

Accepted Answer

Hydrogen bonds between water molecules create cohesive forces at the surface.

Question 16

Which of the following is a correct statement about osmosis?

Accepted Answer

Osmosis is the movement of water across a semipermeable membrane from an area of high water concentration to low water concentration.

Question 17

Which of the following best describes the function of mitochondria in eukaryotic cells?

Accepted Answer

They generate ATP through cellular respiration.

Question 18

Which of the following is a correct statement about the secondary structure of proteins?

Accepted Answer

It involves the formation of alpha helices and beta sheets stabilized by hydrogen bonds.

Question 19

Which of the following is a correct statement about the function of chloroplasts in plant cells?

Accepted Answer

They are the site of photosynthesis, converting light energy into chemical energy.

General Biology Study Guide: Chemistry Essentials, Biological Molecules, and Cell Structure

Study Guide - Practice Questions

Study Guide - Flashcards