Q: Which of the following best describes the overall chemical equation for cellular respiration?

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{ATP}$$

Question 1

Which of the following best describes the overall chemical equation for cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 ightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{ATP}$$

Question 2

During an experiment, phenol red is used as an indicator in water containing germinating seeds. What color change would you expect and why?

Accepted Answer

The solution turns yellow because the seeds release CO$$_2$$, forming carbonic acid and lowering the pH.

Question 3

Which of the following statements about cellular respiration in plants is correct?

Accepted Answer

Both plants and animals perform cellular respiration to release energy from glucose.

Question 4

If you place dormant seeds and germinating seeds in separate containers with phenol red, what is the expected outcome after several hours?

Accepted Answer

Only the container with germinating seeds will turn yellow, indicating active cellular respiration.

Question 5

Which of the following best explains why CO$$_2$$ production is used as an indicator of cellular respiration?

Accepted Answer

CO$$_2 is a $$waste product released when glucose is broken down for energy.

Question 6

A student adds hydrochloric acid (HCl) to a solution and observes a decrease in pH. According to the definition of acids and bases, why does this occur?

Accepted Answer

HCl increases the concentration of H$$^+$$ ions in the solution.

Question 7

Which equation correctly represents the reaction of CO$$_2$$ with water in the context of pH change?

Accepted Answer

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}_2\mathrm{CO}_3 \rightarrow \mathrm{HCO}_3^- + \mathrm{H}^+$$

Question 8

Why does the pH of water decrease when CO$$_2 is $$bubbled through it?

Accepted Answer

CO$$_2$$ reacts with water to form carbonic acid, increasing H$$^+$$ concentration.

Question 9

A solution has a pH of 7. What can you infer about the concentrations of H$$^+$$ and OH$$^-$$ ions in this solution?

Accepted Answer

The concentrations of H$$^+$$ and OH$$^-$$ are equal.

Question 10

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

Accepted Answer

ATP stores and provides energy for cellular processes.

Question 11

If a student hypothesizes that germinating seeds will change the color of phenol red solution, what is the most scientifically sound prediction?

Accepted Answer

The solution will turn yellow because the seeds release CO$$_2$$ during cellular respiration.

Question 12

Which of the following is a correct statement about acids and bases?

Accepted Answer

An acid increases the concentration of H$$^+$$ ions in a solution.

Question 13

A scientist measures the pH of a solution before and after adding CO$$_2. $$The pH drops from 7 to 5. What does this indicate about the solution?

Accepted Answer

The solution became more acidic due to increased H$$^+.$$

Question 14

Which of the following best explains why dormant seeds do not change the color of phenol red solution?

Accepted Answer

Dormant seeds do not perform cellular respiration, so they do not release CO$$_2.$$

Question 15

Which of the following is a real-world application of understanding the relationship between CO$$_2$$ and pH?

Accepted Answer

Increased atmospheric CO$$_2$$ can lead to ocean acidification, affecting marine life.

Question 16

A student claims that cellular respiration only occurs in animals. Which evidence best refutes this claim?

Accepted Answer

Plants perform cellular respiration to release energy from glucose, just like animals.

Question 17

If the concentration of H$$^+ in a $$solution is $$1 	imes 10$$^{-6}$$ M, what is the pH of the solution?

Accepted Answer

pH = 6

Question 18

Which of the following scenarios best demonstrates the importance of cellular respiration in everyday life?

Accepted Answer

A person running a marathon and using stored energy to power muscle contractions.

Question 19

Which of the following best describes the relationship between cellular respiration and the carbon cycle?

Accepted Answer

Cellular respiration adds CO$$_2 to $$the atmosphere as organisms break down glucose.

Cellular Respiration and CO₂: Principles and Laboratory Investigation

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