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

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

Question 1

Which of the following correctly represents the general equation for cellular respiration?

Accepted Answer

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

Question 2

During glycolysis, which of the following is the correct start and end product?

Accepted Answer

Starts with glucose and ends with pyruvate

Question 3

Which stage of cellular respiration produces the most ATP, and where does it occur?

Accepted Answer

Electron transport chain in the inner mitochondrial membrane

Question 4

Which of the following is the correct general equation for alcoholic fermentation?

Accepted Answer

$$C_6H_{12}O_6$ \rightarrow 2\ \mathrm{CO}_2 + 2\ \mathrm{C}_2H_5OH + 2\ \mathrm{ATP}$$

Question 5

What is the main role of ATP synthase in the electron transport chain?

Accepted Answer

To synthesize ATP from ADP and inorganic phosphate using the proton gradient

Question 6

Which of the following best describes the path of oxygen from inhalation to delivery to body tissues?

Accepted Answer

Nasal cavity → trachea → bronchi → alveoli → pulmonary vein → left atrium → left ventricle → aorta → body tissues

Question 7

How does hemoglobin facilitate oxygen transport in the blood?

Accepted Answer

By binding oxygen reversibly, allowing efficient loading in the lungs and unloading in tissues

Question 8

Which of the following is the correct general equation for photosynthesis?

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 9

Where do the light-dependent reactions of photosynthesis take place?

Accepted Answer

In the thylakoid membranes of the chloroplast

Question 10

Which statement best explains the connection between the light reactions and the Calvin cycle (dark reactions) in photosynthesis?

Accepted Answer

The light reactions provide ATP and NADPH to power the Calvin cycle

Question 11

Which of the following is a key difference between cellular respiration and photosynthesis?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases energy from glucose

Question 12

What is the main function of NADPH in photosynthesis?

Accepted Answer

To provide reducing power for the Calvin cycle

Question 13

Why do plants have multiple types of pigments in their chloroplasts?

Accepted Answer

To absorb a wider range of wavelengths of light for photosynthesis

Question 14

Which of the following best describes the role of electron carriers in the light reactions of photosynthesis?

Accepted Answer

They transfer electrons from water to NADP$$^+$$, forming NADPH

Question 15

Which adaptation allows CAM plants to minimize water loss in arid environments?

Accepted Answer

They open their stomata only at night to take in CO$$_2$$

Question 16

During the Krebs cycle, what is the main input and what are the main outputs?

Accepted Answer

Input: acetyl-CoA; Outputs: NADH, FADH$$_2$$, ATP, CO$$_2$$

Question 17

Which of the following best explains why lactic acid fermentation occurs in human muscle cells?

Accepted Answer

To generate ATP when oxygen is scarce by converting pyruvate to lactic acid

Question 18

Which structure within the chloroplast is directly associated with the light-dependent reactions?

Accepted Answer

Thylakoid membrane

Question 19

Which of the following best describes the role of ATP in the Calvin cycle?

Accepted Answer

ATP provides energy for the synthesis of glucose from CO$$_2$$

Question 20

A patient with a genetic mutation affecting hemoglobin's oxygen-binding affinity would most likely show which of the following symptoms?

Accepted Answer

Difficulty releasing oxygen to tissues, leading to fatigue

Cellular Respiration, Gas Exchange, and Photosynthesis: Study Guide

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