Question 1

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

Accepted Answer

Small cell size ensures a high surface-area-to-volume ratio, facilitating efficient exchange of materials with the environment.

Question 2

A scientist observes a cell under a microscope and notes the presence of a nucleoid region, ribosomes, and a cell wall, but no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 3

Which organelle is primarily responsible for modifying, sorting, and shipping proteins to their final destinations within or outside the cell?

Accepted Answer

Golgi apparatus

Question 4

A cell is observed to have a large central vacuole, chloroplasts, and a rigid cell wall. Which of the following is most likely true about this cell?

Accepted Answer

It is a plant cell.

Question 5

Which of the following statements about the phospholipid bilayer of the plasma membrane is correct?

Accepted Answer

Hydrophilic heads face outward, exposed to water, while hydrophobic tails point inward, shielded from water.

Question 6

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

Accepted Answer

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

Question 7

Which of the following is NOT part of the endomembrane system?

Accepted Answer

Peroxisome

Question 8

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

Accepted Answer

Digestion and recycling of cellular waste

Question 9

Which evidence supports the endosymbiont theory for the origin of mitochondria and chloroplasts?

Accepted Answer

Both organelles contain DNA and ribosomes similar to those found in prokaryotes.

Question 10

Which organelle is responsible for converting chemical energy from food into ATP?

Accepted Answer

Mitochondrion

Question 11

Which structure allows plant cells to communicate and share water and nutrients with adjacent cells?

Accepted Answer

Plasmodesmata

Question 12

Which type of microscope would be best for studying the detailed architecture of cell surfaces?

Accepted Answer

Scanning electron microscope (SEM)

Question 13

Which of the following correctly matches the cytoskeletal element with its function?

Accepted Answer

Intermediate filaments: reinforce cell shape and anchor organelles

Question 14

Which of the following cell junctions is responsible for forming leakproof sheets in animal tissues?

Accepted Answer

Tight junctions

Question 15

A cell is observed to have many bound ribosomes attached to its endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Production of secretory proteins

Question 16

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

Accepted Answer

It binds tissue cells together, supports the plasma membrane, and communicates with the cytoskeleton.

Question 17

Which organelle is the site of photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 18

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

Accepted Answer

Storage of calcium ions

Question 19

Which of the following best describes the arrangement of microtubules in eukaryotic cilia and flagella?

Accepted Answer

"9 + 2" arrangement

Question 20

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Synthesis of DNA

Chapter 4: Tour of the Cell – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards