Question 1

Which of the following best describes the role of water's polarity in supporting life on Earth?

Accepted Answer

It allows water molecules to form hydrogen bonds, leading to high cohesion and surface tension.

Question 2

A scientist is studying a molecule with the formula $$C_6H_{12}O_6$. Which type of bond is most likely to be found between the carbon and oxygen atoms in this molecule?

Accepted Answer

Covalent bond

Question 3

Which of the following statements about endergonic and exergonic reactions is correct?

Accepted Answer

Exergonic reactions release free energy, while endergonic reactions require an input of free energy.

Question 4

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

Accepted Answer

Oxygen ($$O_2)$$

Question 5

A mutation causes ATP synthase to malfunction in a cell. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 6

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

Accepted Answer

Hydrogen bonds in ice create a lattice structure that is less dense than liquid water.

Question 7

If a solution has a pH of 4, what is the concentration of hydrogen ions $$[H^+] in $$the solution?

Accepted Answer

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

Question 8

Which of the following scenarios best illustrates the concept of a redox reaction in cellular respiration?

Accepted Answer

NAD+ gains electrons to become NADH during glycolysis.

Question 9

A plant is exposed to light that only contains wavelengths absorbed by chlorophyll a. Which process will be most directly affected if the plant is then placed in the dark?

Accepted Answer

The Calvin cycle will slow down due to lack of ATP and NADPH production.

Question 10

Which of the following best describes the difference between C3 and C4 photosynthesis?

Accepted Answer

C4 plants spatially separate carbon fixation and the Calvin cycle to minimize photorespiration.

Question 11

Which property of water is most important for the transport of nutrients in plants via capillary action?

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

Question 12

A solution contains a mixture of hydrophilic and hydrophobic molecules. Which statement best describes their behavior in water?

Accepted Answer

Hydrophilic molecules will dissolve, while hydrophobic molecules will aggregate together.

Question 13

Which of the following equations correctly represents the relationship between pH and hydrogen ion concentration?

Accepted Answer

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

Question 14

Which of the following best explains why enzymes lower the activation energy of a reaction?

Accepted Answer

They stabilize the transition state, making it easier for reactants to be converted to products.

Question 15

A cell is placed in a solution with a much lower pH than its cytoplasm. What is the most likely immediate effect on the cell's proteins?

Accepted Answer

The proteins may denature due to changes in hydrogen ion concentration.

Question 16

Which of the following is a direct product of the light-dependent reactions of photosynthesis?

Accepted Answer

NADPH

Question 17

If a cell's mitochondria are damaged and cannot maintain a proton gradient, which process will be most directly impaired?

Accepted Answer

ATP synthesis by ATP synthase

Question 18

Which of the following best describes the flow of electrons during aerobic cellular respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ Electron Transport Chain $$\rightarrow$$ Oxygen

Question 19

Which of the following is an example of potential energy in a biological system?

Accepted Answer

The chemical bonds in a molecule of ATP

Question 20

A patient is unable to break down glucose efficiently and accumulates lactic acid in their muscles. Which process is most likely impaired?

Accepted Answer

Aerobic respiration, leading to reliance on fermentation

Core Concepts in General Biology: Molecular Origins, Biochemistry, Energy, Respiration, and Photosynthesis

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