Q: Which of the following equations correctly represents the process of cellular respiration that occurs in mitochondria?

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

Question 1

Which of the following statements best describes a fundamental difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a complex internal structure with membranous organelles, whereas prokaryotic cells lack these organelles.

Question 2

A scientist discovers a new organism with the following characteristics: a cell wall, central vacuole, chloroplasts, and a nucleus. Which type of cell is this organism most likely composed of?

Accepted Answer

Plant cell

Question 3

Which organelle is primarily responsible for the synthesis of lipids and detoxification of harmful substances in eukaryotic cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 4

A patient is diagnosed with Tay-Sachs disease. Which cellular organelle is most directly implicated in the pathology of this disease?

Accepted Answer

Lysosome

Question 5

Which of the following best describes the function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for delivery.

Question 6

During muscle contraction, which cytoskeletal component is most directly involved?

Accepted Answer

Microfilaments (actin filaments)

Question 7

Which of the following structures is found in animal cells but not in plant cells?

Accepted Answer

Centrioles

Question 8

A researcher observes a cell with a double membrane, its own DNA, and internal folded membranes called cristae. Which organelle is being observed?

Accepted Answer

Mitochondrion

Question 9

Which of the following best explains why plant cells can withstand higher internal pressure than animal cells?

Accepted Answer

Plant cells have a rigid cell wall that provides structural support.

Question 10

Which of the following is a function of plasmodesmata in plant cells?

Accepted Answer

They provide channels for communication and transport between adjacent cells.

Question 11

A mutation in the gene encoding connexin would most likely affect which type of cell junction in animal cells?

Accepted Answer

Gap junctions

Question 12

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

They are the site of protein synthesis.

Question 13

Which of the following equations correctly represents the process of cellular respiration that occurs in mitochondria?

Accepted Answer

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

Question 14

Which of the following best explains why defective lysosomes can lead to fatal diseases such as Tay-Sachs?

Accepted Answer

Lysosomes contain enzymes that degrade waste; defects cause toxic buildup of substances.

Question 15

Which of the following is NOT a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Synthesizing proteins

Question 16

A cell is observed to have a large number of peroxisomes. Which of the following is the most likely function of this cell?

Accepted Answer

Detoxification of harmful substances

Question 17

Which of the following best describes the relationship between the rough endoplasmic reticulum (RER) and the Golgi apparatus?

Accepted Answer

The RER synthesizes proteins, which are then sent to the Golgi apparatus for further modification and sorting.

Question 18

Which of the following best explains why mitochondria and chloroplasts are considered to have originated from endosymbiotic events?

Accepted Answer

They have their own DNA and double membranes, similar to prokaryotes.

Question 19

Which of the following cell junctions would be most important in preventing the leakage of digestive enzymes between cells lining the stomach?

Accepted Answer

Tight junctions

Question 20

A mutation causes a cell to lack functional microtubules. Which of the following processes would be most directly affected?

Accepted Answer

Movement of chromosomes during cell division

A Tour of the Cell: Structure, Function, and Organization

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