Q: Which of the following correctly represents the overall chemical equation for cellular respiration?

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \text{energy}$$

Question 1

Which of the following best describes the difference between kinetic and potential energy in a biological system?

Accepted Answer

Kinetic energy is the energy of motion, such as molecules moving across a membrane, while potential energy is stored energy, such as in a concentration gradient.

Question 2

A cell uses ATP to drive the active transport of sodium ions ($$\mathrm{Na^+}) $$against their concentration gradient. Which statement best explains how ATP provides energy for this process?

Accepted Answer

ATP donates a phosphate group to the transport protein, causing a conformational change that moves $$\mathrm{Na^+}$$ across the membrane.

Question 3

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of chemical reactions, increasing the reaction rate.

Question 4

A scientist adds a competitive inhibitor to an enzyme-catalyzed reaction. What is the most likely effect on the reaction?

Accepted Answer

The inhibitor binds to the enzyme's active site, preventing the substrate from binding and decreasing the reaction rate.

Question 5

Which of the following best describes the structure and function of a cell membrane?

Accepted Answer

A double layer of phospholipids with embedded proteins that regulates the passage of materials.

Question 6

Which of the following molecules can most easily cross a cell membrane by simple diffusion?

Accepted Answer

Small nonpolar molecules like $$\mathrm{O_2$}$$ and $$\mathrm{CO_2$}$$

Question 7

Which process requires energy input from the cell and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 8

A white blood cell engulfs a bacterium by surrounding it with its membrane and forming a vesicle. What is this process called?

Accepted Answer

Endocytosis

Question 9

Which of the following best distinguishes autotrophs from heterotrophs?

Accepted Answer

Autotrophs use inorganic molecules to produce organic molecules, while heterotrophs must consume organic molecules.

Question 10

Which of the following correctly represents the overall chemical equation for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + 	ext{energy}$$

Question 11

During which stage of cellular respiration is the majority of ATP produced, and where does this stage occur?

Accepted Answer

Electron transport chain; inner mitochondrial membrane

Question 12

Why is oxygen required for cellular respiration?

Accepted Answer

Oxygen is needed to accept electrons at the end of the electron transport chain, forming water.

Question 13

Under what conditions does fermentation occur in human muscle cells, and what is the main product?

Accepted Answer

When oxygen is scarce; main product is lactic acid

Question 14

Which part of a leaf contains the majority of chloroplasts and is the primary site of photosynthesis?

Accepted Answer

Palisade mesophyll

Question 15

Which structure within the chloroplast is the site of the light-dependent reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 16

What happens when chlorophyll absorbs light energy during photosynthesis?

Accepted Answer

It excites electrons, which are then transferred to an electron transport chain.

Question 17

During photosynthesis, what is the role of water ($$\mathrm{H_2O}$$), and in which stage is it used?

Accepted Answer

Water provides electrons during the light-dependent reactions.

Question 18

Which of the following correctly matches the two major stages of photosynthesis with their main inputs and outputs?

Accepted Answer

Light-dependent reactions: input $$\mathrm{H_2O}$$ and light, output $$\mathrm{O_2$}$$, ATP, and NADPH; Calvin Cycle: input $$\mathrm{CO_2$}$$, ATP, and NADPH, output glucose

Question 19

What is the final product of the Calvin Cycle, and how many turns of the cycle are required to produce one molecule of this product?

Accepted Answer

G3P (glyceraldehyde-3-phosphate); 3 turns

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