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

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

Question 1

Which of the following best describes the role of water's polarity in its ability to dissolve ionic compounds?

Accepted Answer

Water's polar molecules form hydrogen bonds with ionic compounds, breaking them apart.

Question 2

A scientist is studying a reaction in which glucose is broken down to release energy. Which type of reaction is this, and what is the sign of $$\Delta G$$ for the process?

Accepted Answer

Exothermic; $$\Delta G \u003c 0$$

Question 3

Which of the following statements about ATP synthase is correct?

Accepted Answer

ATP synthase is embedded in the mitochondrial membrane and synthesizes ATP using a proton gradient.

Question 4

During the Calvin Cycle, which phase is responsible for the incorporation of CO$$_2$$ into organic molecules?

Accepted Answer

Fixation

Question 5

A molecule has an atomic number of 8 and an atomic mass of 16. How many neutrons does it have?

Accepted Answer

8

Question 6

Which of the following best explains why hydrophobic molecules do not dissolve in water?

Accepted Answer

Hydrophobic molecules lack charged or polar regions to interact with water's polarity.

Question 7

Which process in cellular respiration produces the most ATP per glucose molecule?

Accepted Answer

Oxidative Phosphorylation (Electron Transport Chain and ATP Synthase)

Question 8

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

Accepted Answer

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

Question 9

Which of the following is a correct description of a reduction-oxidation (redox) reaction?

Accepted Answer

A reaction where one reactant loses electrons and another gains electrons.

Question 10

Which property of water allows it to moderate temperature changes in living organisms?

Accepted Answer

High specific heat capacity

Question 11

A mutation causes a cell to lack functional electron carriers in the electron transport chain. What is the most likely consequence?

Accepted Answer

The cell will be unable to efficiently produce ATP through oxidative phosphorylation.

Question 12

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 13

In photosynthesis, what is the primary function of the light-dependent reactions?

Accepted Answer

To generate ATP and NADPH for use in the Calvin Cycle.

Question 14

Which of the following equations correctly represents the relationship between kinetic energy $$(KE)$$, mass $$(m)$$, and velocity $$(v)$$?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 15

A plant exposed to only green light will likely show reduced photosynthetic activity. Why?

Accepted Answer

Green light is reflected by chlorophyll, so less energy is absorbed for photosynthesis.

Question 16

Which of the following is true about the final electron acceptor in aerobic cellular respiration?

Accepted Answer

It is oxygen, which combines with electrons and protons to form water.

Question 17

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

Accepted Answer

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

Question 18

Which of the following is a correct sequence of events in cellular respiration?

Accepted Answer

Glycolysis → Pyruvate Processing → Citric Acid Cycle → Electron Transport Chain

Question 19

Which of the following statements about C3 and C4 photosynthesis is correct?

Accepted Answer

C4 plants use a spatial separation of steps to minimize photorespiration, while C3 plants do not.

General Biology Study Guide: Molecular Origin, Chemical Basis, Energy, Cellular Respiration, and Photosynthesis

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