Question 1

Which of the following best explains why cells are typically small in size?

Accepted Answer

Small cells have a greater surface area to volume ratio, which facilitates efficient exchange of materials with their environment.

Question 2

A scientist wants to study the internal structure of mitochondria at very high resolution. Which microscope should they use and why?

Accepted Answer

Transmission electron microscope (TEM), because it passes electrons through the specimen, revealing internal structures at high resolution.

Question 3

Which organelle is primarily responsible for detoxifying drugs and poisons in liver cells?

Accepted Answer

Smooth endoplasmic reticulum (Smooth ER)

Question 4

A mutation prevents the formation of nuclear pores in a eukaryotic cell. Which process would be most directly affected?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm

Question 5

Which of the following statements about the endosymbiont theory is supported by evidence?

Accepted Answer

Mitochondria and chloroplasts contain their own DNA and ribosomes, similar to prokaryotes.

Question 6

Which of the following best describes the function of lysosomes in animal cells?

Accepted Answer

They contain hydrolytic enzymes that digest macromolecules and recycle cellular components.

Question 7

A muscle cell is observed to have an unusually high number of mitochondria. What is the most likely explanation for this observation?

Accepted Answer

Muscle cells require large amounts of ATP for contraction, so they contain many mitochondria.

Question 8

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

Accepted Answer

Cell wall

Question 9

A researcher isolates a cell with the following characteristics: no nucleus, DNA in a nucleoid region, and no membrane-bound organelles. This cell is most likely:

Accepted Answer

A prokaryotic cell

Question 10

Which of the following best describes the role of the Golgi apparatus in the endomembrane system?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 11

Which cytoskeletal component is primarily responsible for the separation of chromosomes during cell division?

Accepted Answer

Microtubules

Question 12

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 13

Which of the following is a function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It provides structural support, helps bind cells together, and facilitates cell communication.

Question 14

Which cell junction allows for the direct passage of ions and small molecules between adjacent animal cells, facilitating communication?

Accepted Answer

Gap junctions

Question 15

Which of the following best describes the function of peroxisomes?

Accepted Answer

They contain enzymes that detoxify harmful substances by converting them to hydrogen peroxide, which is then converted to water.

Question 16

A mutation disrupts the function of dynein motor proteins in a cell. Which cellular process would be most directly affected?

Accepted Answer

Movement of cilia and flagella

Question 17

Which of the following best describes the composition of the plasma membrane?

Accepted Answer

A double layer of phospholipids with embedded proteins

Question 18

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Question 19

Which of the following best explains why the rough endoplasmic reticulum (Rough ER) is described as 'rough'?

Accepted Answer

It is studded with ribosomes on its cytoplasmic surface.

Question 20

Which of the following best describes the process of cell fractionation?

Accepted Answer

It separates cellular components based on size and density using centrifugation.

A Tour of the Cell: Structure, Function, and Methods of Study

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