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.

$$	ext{Surface area to volume ratio} = \frac{	ext{surface area}}{	ext{volume}}$$

Question 2

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

Accepted Answer

Transmission electron microscope (TEM), because it passes electrons through the specimen, providing the highest resolution for internal structures.

Question 3

Which organelle is primarily responsible for the synthesis of lipids, detoxification of drugs, and storage of calcium ions?

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 and ribosomal subunits between the nucleus and cytoplasm

Question 5

Which of the following statements about the endosymbiont theory is CORRECT?

Accepted Answer

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

Question 6

Which of the following is NOT a function of the Golgi apparatus?

Accepted Answer

Synthesizing ATP for cellular energy

Question 7

A muscle cell is unable to contract due to a lack of calcium ion release. Which organelle is most likely malfunctioning?

Accepted Answer

Smooth endoplasmic reticulum

Question 8

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 9

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

Accepted Answer

Plant cell

Question 10

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

Accepted Answer

Microtubules

Question 11

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

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

A scientist isolates a structure from a cell that is composed of a double layer of phospholipids with embedded proteins. Which structure is this most likely to be?

Accepted Answer

Plasma membrane

Question 14

Which of the following cell junctions 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 statements about the extracellular matrix (ECM) in animal cells is TRUE?

Accepted Answer

The ECM is composed mainly of glycoproteins such as collagen, proteoglycans, and fibronectin, and helps cells bind together and communicate.

Question 16

Which organelle is the main site of ATP production in eukaryotic cells, and what process occurs there?

Accepted Answer

Mitochondrion; cellular respiration

Question 17

A mutation causes a cell to lack dynein motor proteins. Which cellular process would be most directly affected?

Accepted Answer

Movement of cilia and flagella

Question 18

Which of the following best describes the function of the nucleolus?

Accepted Answer

It is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.

Question 19

Which of the following is a function of the central vacuole in plant cells?

Accepted Answer

It stores water and inorganic ions, helping maintain cell rigidity and structure.

Question 20

Which of the following best explains why the plasma membrane is described as a 'selective barrier'?

Accepted Answer

It allows certain molecules, such as oxygen and nutrients, to enter the cell while preventing the passage of harmful substances.

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

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