Q: Which of the following is the correct simplified 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 what happens to glucose during aerobic cellular respiration?

Accepted Answer

Glucose is oxidized to form carbon dioxide.

Question 2

Which of the following is the correct simplified 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 3

During oxidative phosphorylation, what is the primary role of oxygen?

Accepted Answer

To serve as the final electron acceptor in the electron transport chain.

Question 4

Which of the following best explains why fermentation is necessary for glycolysis to continue in the absence of oxygen?

Accepted Answer

Fermentation regenerates NAD$$^+$$ required for glycolysis.

Question 5

Which laboratory organism is commonly used to study alcohol fermentation?

Accepted Answer

Saccharomyces cerevisiae (yeast)

Question 6

Which of the following statements about the Krebs (TCA) cycle is correct?

Accepted Answer

It occurs in the mitochondrial matrix and produces NADH, FADH$$_2$$, and CO$$_2.$$

Question 7

Which of the following best describes the difference between autotrophs and heterotrophs?

Accepted Answer

Autotrophs produce their own organic molecules from inorganic sources, while heterotrophs consume organic molecules produced by other organisms.

Question 8

Which of the following groups contains both autotrophic and heterotrophic species?

Accepted Answer

Protists

Question 9

What is the main function of pigments such as chlorophyll in the light-harvesting complexes of chloroplasts?

Accepted Answer

To absorb light energy and transfer it to the reaction center.

Question 10

Why do photosynthetic pigments appear colored to us?

Accepted Answer

They absorb certain wavelengths of light and reflect others.

Question 11

Which of the following best describes the location and function of ATP synthase in mitochondria?

Accepted Answer

Located in the inner membrane, it synthesizes ATP from ADP and inorganic phosphate using the proton gradient.

Question 12

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

Accepted Answer

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

Question 13

Which enzyme is responsible for carbon fixation during the Calvin Cycle?

Accepted Answer

Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase)

Question 14

Why is a hydrophobic solvent used in chromatography of photosynthetic pigments instead of water?

Accepted Answer

Photosynthetic pigments are embedded in hydrophobic regions of membranes and dissolve better in hydrophobic solvents.

Question 15

Which of the following correctly matches the process with its cellular location?

Accepted Answer

Light reactions – thylakoid membrane

Question 16

Which molecules are reduced and which are oxidized during photosynthesis?

Accepted Answer

CO$$_2 is $$reduced and H$$_2O is $$oxidized.

Question 17

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvate

Question 18

A patient is diagnosed with a mitochondrial disorder that impairs the function of the inner mitochondrial membrane. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 19

Which of the following is true regarding the energy changes in photosynthesis?

Accepted Answer

Photosynthesis is an endergonic reaction.

Question 20

Which two products of glycolysis are also the reactants for alcohol fermentation in yeast?

Accepted Answer

Pyruvate and NADH

BIO 130L Quiz 3 Review: Cellular Respiration & Photosynthesis Study Guidance

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