Question 1

Which of the following best explains why water is able to dissolve many substances important for life?

Accepted Answer

Water is a polar molecule, allowing it to form hydrogen bonds and interact with charged and polar substances.

Question 2

A scientist is testing the effect of sunlight on plant growth. She sets up two groups: one exposed to sunlight and one kept in darkness. What is the independent variable in this experiment?

Accepted Answer

Exposure to sunlight

Question 3

Which of the following statements about natural selection is correct?

Accepted Answer

Natural selection acts on heritable traits that increase reproductive success.

Question 4

Which chemical property of water is most responsible for its ability to moderate Earth's climate?

Accepted Answer

Its high specific heat capacity due to hydrogen bonding

Question 5

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

Accepted Answer

$$1 	imes 10$$^{-4}$$ M

Question 6

Which of the following best describes a scientific hypothesis?

Accepted Answer

A tentative answer to a well-framed question that can be tested

Question 7

Which of the following is an example of deductive reasoning in scientific inquiry?

Accepted Answer

Using general principles to predict specific results

Question 8

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds keep water molecules farther apart in the solid state.

Question 9

Which of the following is NOT a unifying theme in biology?

Accepted Answer

Randomness

Question 10

A researcher wants to test whether a new fertilizer increases crop yield. She applies the fertilizer to one field and leaves another field untreated. What is the dependent variable in this experiment?

Accepted Answer

The crop yield measured at the end of the season

Question 11

Which of the following best describes the relationship between structure and function in biological molecules?

Accepted Answer

The function of a molecule is determined by its structure, such as the shape of an enzyme's active site.

Question 12

Which of the following is a correct statement about covalent bonds?

Accepted Answer

Covalent bonds involve the sharing of electron pairs between atoms.

Question 13

Which of the following is a real-world example of the application of emergent properties in biology?

Accepted Answer

The coordinated beating of heart cells produces a heartbeat, which is not a property of individual cells.

Question 14

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

Accepted Answer

Hydrogen bonds give water its cohesion, adhesion, and high specific heat.

Question 15

Which of the following is the correct formula for calculating the pH of a solution?

Accepted Answer

$$pH = -\log_{10} [H^+]$$

Question 16

Which of the following is an example of a controlled experiment?

Accepted Answer

Testing the effect of different temperatures on enzyme activity while keeping all other variables constant

Question 17

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

Accepted Answer

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

Question 18

Which of the following is a correct statement about chemical reactions?

Accepted Answer

Chemical reactions change reactants into products by breaking and forming chemical bonds.

Question 19

A scientist measures the mass of a sample before and after a chemical reaction and finds no change. Which principle does this observation support?

Accepted Answer

The law of conservation of mass

Question 20

Which of the following is a real-world example of the importance of surface tension in biology?

Accepted Answer

Insects such as water striders walking on the surface of a pond

Core Concepts in General Biology: Matter, Atoms, and Scientific Inquiry

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