$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6 \mathrm{O}_2$$

Question 1

Which of the following best describes the law of conservation of energy as it applies to biological systems?

Accepted Answer

Energy can be converted from one form to another, but it cannot be created or destroyed.

Question 2

A child climbs to the top of a slide and then slides down. Which statement correctly identifies the energy transformations involved?

Accepted Answer

Potential energy is converted to kinetic energy as the child slides down.

Question 3

During photosynthesis, which of the following correctly represents the overall chemical equation? (Use LaTeX formatting for the equation.)

Accepted Answer

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6 \mathrm{O}_2$$

Question 4

Which organelle is responsible for capturing light energy and converting it into chemical energy in plant cells?

Accepted Answer

Chloroplast

Question 5

A plant leaf appears green because:

Accepted Answer

Chlorophyll reflects green light and absorbs blue/violet and orange/red light.

Question 6

Which of the following best describes the role of ATP in cellular processes?

Accepted Answer

ATP acts as an energy shuttle, transferring chemical energy for cellular work.

Question 7

During the light reactions of photosynthesis, what is the source of electrons that are excited by sunlight?

Accepted Answer

Water molecules

Question 8

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

The Calvin cycle uses ATP and NADPH to convert CO2 into sugars.

Question 9

A marathon runner's muscle cells switch to lactic acid fermentation during intense exercise. What is the main reason for this metabolic shift?

Accepted Answer

The cells cannot supply enough oxygen for aerobic respiration, so they use fermentation to produce ATP.

Question 10

Which of the following correctly orders the stages of aerobic cellular respiration and their main locations?

Accepted Answer

Glycolysis (cytoplasm) → Citric Acid Cycle (mitochondrial matrix) → Electron Transport Chain (inner mitochondrial membrane)

Question 11

Which of the following is a correct comparison between fermentation and aerobic respiration?

Accepted Answer

Fermentation produces less ATP per glucose molecule than aerobic respiration.

Question 12

A yeast cell is placed in an anaerobic environment with abundant glucose. Which products will it generate through fermentation?

Accepted Answer

CO2 and ethyl alcohol

Question 13

Which of the following best explains why energy conversions in living systems are never 100% efficient?

Accepted Answer

Some energy is always lost as heat, increasing the system's entropy.

Question 14

Which molecule acts as an electron shuttle during the light reactions of photosynthesis?

Accepted Answer

NADPH

Question 15

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following would most likely be observed?

Accepted Answer

Decreased ATP production and increased reliance on fermentation.

Question 16

Which of the following is the main input and output of glycolysis? (Use LaTeX formatting for the equation.)

Accepted Answer

$$	ext{Glucose} ightarrow 2 	ext{Pyruvic Acid} + 2 	ext{ATP} + 2 	ext{NADH}$$

Question 17

Which of the following best describes the fate of the oxygen produced during photosynthesis?

Accepted Answer

It is released into the atmosphere as a by-product.

Question 18

If a plant's stomata are blocked, which process would be directly affected first?

Accepted Answer

Absorption of carbon dioxide for photosynthesis

Question 19

Which of the following statements about ATP and ADP is correct?

Accepted Answer

ATP contains three phosphate groups, while ADP contains two.

Question 20

A person consumes more Calories than they expend over a period of time. According to the concept of kilocalories, what is the likely outcome?

Accepted Answer

They will gain weight.

Energy and Life: Photosynthesis, Cellular Respiration, and Metabolism

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