Question 1

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

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in unequal sharing of electrons.

Question 2

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-5}$$ M. What is the pH of this solution?

Accepted Answer

$$5$$

Question 3

Which of the following is NOT a characteristic of the chemistry of life?

Accepted Answer

It depends on the interaction of simple, roughly spherical compounds.

Question 4

Which type of bond is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 5

A sample of double-stranded DNA contains $$24\%$$ thymine. Approximately what percent of the sample is guanine?

Accepted Answer

$$26\%$$

Question 6

Which of the following best describes the structure of a biological membrane according to the fluid mosaic model?

Accepted Answer

It is composed of a double layer of phospholipids with embedded proteins.

Question 7

Which of the following macromolecules stores the most energy per gram?

Accepted Answer

Lipids

Question 8

During cellular respiration, which molecule is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen

Question 9

Which of the following is NOT a step in transcription or translation?

Accepted Answer

Lysis

Question 10

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction, increasing the reaction rate.

Question 11

Which of the following elements is most likely to form four covalent bonds with other atoms?

Accepted Answer

Carbon

Question 12

Which of the following is a function of the smooth endoplasmic reticulum (ER) in eukaryotic cells?

Accepted Answer

Synthesis of lipids

Question 13

If a cell is placed in a hypertonic solution, what will most likely happen to the cell?

Accepted Answer

It will lose water and shrink.

Question 14

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP stores and transfers energy for cellular work.

Question 15

Which of the following is NOT a function of carbohydrates in cells?

Accepted Answer

Storing genetic information

Question 16

Which of the following statements about diffusion is correct?

Accepted Answer

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.

Question 17

Which of the following is the correct order of protein structure from simplest to most complex?

Accepted Answer

Primary, secondary, tertiary, quaternary

Question 18

Which of the following is a real-world example of a negative feedback mechanism in biology?

Accepted Answer

Regulation of blood glucose levels by insulin

Question 19

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

Ribosomes synthesize proteins by translating mRNA.

Question 20

Which of the following statements about photosynthesis is correct?

Accepted Answer

Photosynthesis converts light energy into chemical energy stored in glucose.

General Biology Exam Review: Key Concepts and Practice Questions

Study Guide - Practice Questions