Question 1

Which of the following best describes the main difference between magnification and resolution in microscopy?

Accepted Answer

Magnification increases the size of the image, while resolution increases the clarity and ability to distinguish two close objects as separate.

Question 2

A scientist is using a transmission electron microscope (TEM) to study the internal structure of a mitochondrion. Which property of TEM allows this detailed observation?

Accepted Answer

TEM uses a beam of electrons that passes through thin sections of the specimen, providing high-resolution images of internal structures.

Question 3

Which of the following is NOT a component of the endomembrane system in eukaryotic cells?

Accepted Answer

Mitochondria

Question 4

A mutation causes a cell to produce defective lysosomes. Which of the following is a likely consequence?

Accepted Answer

The cell will accumulate undigested macromolecules, leading to cellular dysfunction.

Question 5

According to the endosymbiotic theory, which of the following organelles originated from free-living prokaryotes?

Accepted Answer

Mitochondria and chloroplasts

Question 6

Which structure is responsible for synthesizing proteins that are exported from the cell?

Accepted Answer

Ribosomes bound to the rough endoplasmic reticulum

Question 7

A plant cell is placed in a hypotonic solution. Which organelle helps prevent the cell from bursting, and what is the mechanism?

Accepted Answer

The cell wall provides structural support, preventing excessive expansion due to osmotic pressure.

Question 8

Which of the following best explains why prokaryotic cells are generally smaller than eukaryotic cells?

Accepted Answer

Prokaryotic cells lack internal compartmentalization, limiting their size due to surface area-to-volume constraints.

Question 9

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles.

Question 10

A researcher observes a eukaryotic cell with abundant smooth endoplasmic reticulum. Which function is this cell likely specialized for?

Accepted Answer

Synthesis of lipids and detoxification of drugs and poisons.

Question 11

Which of the following best describes the structure of the plasma membrane according to the fluid mosaic model?

Accepted Answer

A bilayer of phospholipids with embedded proteins that can move laterally within the layer.

Question 12

Which of the following cell junctions allows for the direct passage of ions and small molecules between adjacent animal cells?

Accepted Answer

Gap junctions

Question 13

A mutation disrupts the function of microtubules in a cell. Which of the following processes would be most directly affected?

Accepted Answer

Movement of cilia and flagella

Question 14

Which of the following best explains why mitochondria and chloroplasts have their own DNA and ribosomes?

Accepted Answer

They originated from ancestral prokaryotes that were engulfed by a host cell, as described by the endosymbiotic theory.

Question 15

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 16

Which of the following best describes the function of the extracellular matrix in animal cells?

Accepted Answer

It provides structural support, helps regulate cell behavior, and facilitates communication between cells.

Question 17

A scientist wants to distinguish between prokaryotic and eukaryotic cells under a microscope. Which feature should they look for?

Accepted Answer

Presence of a membrane-bound nucleus

Question 18

Which of the following equations correctly represents the surface area-to-volume ratio for a spherical cell of radius $$r$$?

Accepted Answer

$$\frac{4 \pi r^2$}{\frac{4}{3} \pi r^3$}$$

Question 19

A cell is unable to transport proteins from the rough ER to the Golgi apparatus. Which process is most likely disrupted?

Accepted Answer

Vesicle formation and trafficking

Question 20

Which of the following best explains why animal cells do not have chloroplasts?

Accepted Answer

Animal cells obtain energy from food rather than by photosynthesis.

A Tour of the Cell: Structure and Function in Eukaryotic and Prokaryotic Cells

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