Q: During cellular respiration, mitochondria use oxygen to help release energy from food molecules. Which equation best represents this process?

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

Q: Which equation represents the overall process of photosynthesis?

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

Question 1

Which of the following best describes the primary function of peroxisomes in eukaryotic cells?

Accepted Answer

They contain enzymes that transfer hydrogen from various substrates to oxygen, producing hydrogen peroxide.

Question 2

During cellular respiration, mitochondria use oxygen to help release energy from food molecules. Which equation best represents this process?

Accepted Answer

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

Question 3

Which structure within the mitochondrion contains enzymes for the citric acid cycle and is crucial for ATP production?

Accepted Answer

Mitochondrial matrix

Question 4

A genetic mutation disrupts the function of catalase in peroxisomes. What is the most likely cellular consequence?

Accepted Answer

Accumulation of hydrogen peroxide, leading to oxidative damage.

Question 5

Which of the following statements about the endosymbiotic theory is correct?

Accepted Answer

Mitochondria and chloroplasts evolved from prokaryotic cells engulfed by an ancestral eukaryotic cell.

Question 6

Which part of the chloroplast is the site of the Calvin cycle?

Accepted Answer

Stroma

Question 7

A scientist isolates a membrane-bound organelle that produces hydrogen peroxide as a byproduct. Which enzyme is most likely present in this organelle to prevent cellular damage?

Accepted Answer

Catalase

Question 8

Which of the following best explains why mitochondria have highly folded inner membranes (cristae)?

Accepted Answer

To increase the surface area for ATP-producing enzymes.

Question 9

Which process occurs in the thylakoid membranes of chloroplasts?

Accepted Answer

Light-dependent reactions of photosynthesis

Question 10

A cell is observed to have both mitochondria and chloroplasts. Which type of organism is this cell most likely from?

Accepted Answer

A plant

Question 11

Which of the following is a direct product of the light-dependent reactions in photosynthesis?

Accepted Answer

ATP and NADPH

Question 12

If a mutation prevents the formation of the mitochondrial cristae, what is the most likely effect on the cell?

Accepted Answer

Reduced efficiency of ATP production due to decreased surface area for electron transport.

Question 13

Which equation represents the overall process of photosynthesis?

Accepted Answer

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

Question 14

Which of the following is NOT a function of peroxisomes?

Accepted Answer

Synthesis of ATP via oxidative phosphorylation

Question 15

Which structure in the chloroplast contains the molecular complexes of the light reactions?

Accepted Answer

Thylakoid membrane

Question 16

A cell is unable to carry out the Calvin cycle. Which structure is most likely defective?

Accepted Answer

Stroma

Question 17

Which of the following best explains the evolutionary origin of mitochondria and chloroplasts according to the endosymbiotic theory?

Accepted Answer

They originated from prokaryotic cells that were engulfed by a host cell.

Question 18

Which of the following is a similarity between mitochondria and chloroplasts?

Accepted Answer

Both have a double membrane structure.

Question 19

A patient has a disorder affecting the enzymes in the mitochondrial matrix. Which metabolic pathway is most likely impaired?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 20

Which of the following is the correct sequence of membranes encountered when moving from the cytoplasm into the mitochondrial matrix?

Accepted Answer

Outer membrane → Intermembrane space → Inner membrane → Matrix

Cellular Organelles: Structure, Function, and Evolution

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