Q: Which of the following equations correctly represents the relationship between surface area and volume for a spherical cell as it increases in size?

$$\text{Surface Area} = 4\pi r^2$, $$\text{Volume} = \frac{4}{3}\pi $$r^3$$, so $$\frac{\text{Surface Area}}{\text{Volume}} = \frac{3}{r}$$

Question 1

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

Accepted Answer

Smaller cells have a higher surface area to volume ratio, allowing for more efficient exchange of materials with their environment.

Question 2

A scientist is studying a cell with the following characteristics: DNA located in a nucleoid, no membrane-bound organelles, and a cell wall made of peptidoglycan. What type of cell is this?

Accepted Answer

A prokaryotic cell

Question 3

Which of the following structures is unique to plant cells and is responsible for maintaining turgor pressure?

Accepted Answer

Central vacuole

Question 4

A protein is synthesized by a ribosome attached to the rough endoplasmic reticulum (ER). Which of the following best describes the path this protein will take to be secreted from the cell?

Accepted Answer

Rough ER → transport vesicle → Golgi apparatus → transport vesicle → plasma membrane

Question 5

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 6

A mutation disrupts the nuclear pore complex in a eukaryotic cell. Which process would be most directly affected?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm

Question 7

Which of the following is a function of the smooth endoplasmic reticulum (ER)?

Accepted Answer

Synthesis of lipids and detoxification of drugs and poisons

Question 8

Which of the following best describes the main structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 9

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 such as alcohol

Question 10

Which of the following equations correctly represents the relationship between surface area and volume for a spherical cell as it increases in size?

Accepted Answer

$$	ext{Surface Area} = 4\pi r^2$, $$	ext{Volume} = \frac{4}{3}\pi $$r^3$$, so $$\frac{	ext{Surface Area}}{	ext{Volume}} = \frac{3}{r}$$

Question 11

Which of the following best explains why mitochondria and chloroplasts are considered to have evolved from prokaryotic cells?

Accepted Answer

They contain their own DNA and ribosomes, similar to prokaryotes.

Question 12

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

Accepted Answer

It provides structural support and helps transmit signals from outside the cell to the cytoskeleton.

Question 13

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

Accepted Answer

Gap junctions

Question 14

A mutation causes a plant cell to lack cellulose in its cell wall. Which of the following would most likely be affected?

Accepted Answer

The structural support and rigidity of the cell

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

Microtubules

Question 17

A researcher observes a eukaryotic cell with an extensive network of rough endoplasmic reticulum (ER). Which of the following is the most likely function of this cell?

Accepted Answer

Production of large amounts of proteins for export

Question 18

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

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

Question 19

Which of the following statements about free and bound ribosomes is correct?

Accepted Answer

Free ribosomes synthesize proteins that function in the cytosol, while bound ribosomes synthesize proteins destined for membranes or secretion.

A Tour of Cells: Structure and Function in General Biology

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