Question 1

Which of the following best describes the difference between an element and a compound?

Accepted Answer

Elements cannot be broken down by chemical reactions, while compounds can be separated into their constituent elements.

Question 2

Which property of water allows insects like water striders to walk on its surface?

Accepted Answer

Water's surface tension due to cohesion between molecules

Question 3

A solution has a pH of 4. What is the concentration of hydrogen ions $[H^+]$ in this solution?

Accepted Answer

$[H^+] = 1 	imes 10^{-4}$ M

Question 4

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

Accepted Answer

The oxygen atom in water is more electronegative than hydrogen, creating a partial negative charge on oxygen and a partial positive charge on hydrogen.

Question 5

Which type of chemical bond is responsible for the unique properties of water, such as cohesion and adhesion?

Accepted Answer

Hydrogen bonds

Question 6

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a relatively constant pH by absorbing excess H$^+$ or OH$^-$ ions.

Question 7

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different numbers of neutrons but the same number of protons.

Question 8

Which of the following is a correct example of a hydrocarbon?

Accepted Answer

CH$_4$

Question 9

Which functional group is most likely to act as an acid by donating a proton (H$^+$) in solution?

Accepted Answer

Carboxyl group ($-COOH$)

Question 10

Which of the following best explains why carbon is able to form such a wide variety of molecules?

Accepted Answer

Carbon has four valence electrons, allowing it to form up to four covalent bonds with other atoms.

Question 11

A scientist is studying the effect of temperature on enzyme activity. She sets up an experiment with different temperatures and measures the rate of reaction. What is the independent variable in this experiment?

Accepted Answer

The temperature at which the reaction occurs

Question 12

Which of the following is a correct statement about the relationship between atomic number and mass number?

Accepted Answer

Atomic number is the number of protons, while mass number is the sum of protons and neutrons.

Question 13

Which of the following best describes the role of a hypothesis in scientific inquiry?

Accepted Answer

A hypothesis is a tentative explanation that can be tested and falsified.

Question 14

Which of the following is a consequence of the high specific heat of water for living organisms?

Accepted Answer

Water resists changes in temperature, helping organisms maintain stable internal environments.

Question 15

Which of the following best explains why changes in pH can be dangerous to life?

Accepted Answer

Changes in pH can disrupt the structure and function of biological molecules such as proteins and enzymes.

Question 16

Which of the following is true about the addition or removal of a phosphate group in biological molecules?

Accepted Answer

It is a key way to regulate the activity of proteins and other molecules.

Question 17

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 18

Which of the following is a correct statement about the organization of matter?

Accepted Answer

Molecules are made up of atoms bonded together.

Question 19

Which of the following best explains the importance of functional groups in organic molecules?

Accepted Answer

Functional groups determine the chemical reactivity and function of organic molecules.

Question 20

Which of the following statements about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structural arrangements.

General Biology I: Foundational Concepts and Learning Objectives

Study Guide - Practice Questions

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