Question 1

Which of the following scientists is credited with first observing and describing cells under a microscope?

Accepted Answer

Robert Hooke

Question 2

Which of the following is a major limitation of light microscopes compared to electron microscopes?

Accepted Answer

They have a lower resolving power, limiting the ability to see fine cellular details.

Question 3

Which three features are common to all cells, whether prokaryotic or eukaryotic?

Accepted Answer

Plasma membrane, cytoplasm, and DNA

Question 4

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

Accepted Answer

Eukaryotic cells have their DNA enclosed in a nucleus, while prokaryotic cells do not.

Question 5

Which component is found in the cell wall of most bacteria but is absent in Archaea?

Accepted Answer

Peptidoglycan

Question 6

Flagella are important for which of the following cellular functions?

Accepted Answer

Cellular movement and motility

Question 7

Which organelle is primarily responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 8

In plant cells, which structure is functionally analogous to the animal cell's lysosome?

Accepted Answer

Vacuole

Question 9

Which cytoskeletal component is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 10

A scientist is studying a cell that contains a cell wall, a large central vacuole, and chloroplasts. Which type of cell is she most likely observing?

Accepted Answer

Plant cell

Question 11

Which of the following best describes the main function of the extracellular matrix (ECM) in animal tissues?

Accepted Answer

It provides structural support and mediates cell signaling.

Question 12

Which type of cell junction allows ions and small molecules to pass directly from one animal cell to another?

Accepted Answer

Gap junction

Question 13

A mutation disrupts the function of desmosomes in skin cells. Which of the following symptoms would most likely result?

Accepted Answer

Loss of mechanical strength and increased skin blistering

Question 14

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

Accepted Answer

They possess a rigid cell wall composed mainly of cellulose.

Question 15

Which of the following best describes the role of tight junctions in epithelial tissues?

Accepted Answer

They prevent the passage of substances between adjacent cells.

Question 16

A researcher observes a eukaryotic cell with abundant rough endoplasmic reticulum (RER). Which function is this cell most likely specialized for?

Accepted Answer

Protein secretion

Question 17

Which of the following best describes the main function of ribosomes in all cells?

Accepted Answer

Protein synthesis

Question 18

Which of the following equations correctly represents the surface area to volume ratio ($$SA:V) $$for a spherical cell of radius $$r$$?

Accepted Answer

$$SA:V = \frac{4\pi r^2$}{\frac{4}{3}\pi r^3$}$$

Question 19

A patient is diagnosed with a genetic disorder that affects the function of microtubules. Which of the following cellular processes is most likely to be impaired?

Accepted Answer

Chromosome separation during mitosis

Question 20

Which of the following best explains why antibiotics that target peptidoglycan synthesis are effective against bacteria but not human cells?

Accepted Answer

Human cells lack a cell wall containing peptidoglycan.

Cell Structure and Function: Key Concepts for General Biology

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