Question 1

Which of the following best explains why electron microscopes are necessary to study organelles within cells?

Accepted Answer

The resolution barrier of light microscopes prevents visualization of structures smaller than $$0.2\ \mu m.$$

Question 2

A scientist wants to study the surface topography of a pollen grain. Which type of microscopy should they use and why?

Accepted Answer

Scanning electron microscopy (SEM), because it scans the surface and translates electron patterns into a 3D image.

Question 3

Which of the following statements correctly compares prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 4

Why is the ratio of surface area to volume critical for cell function, especially in cells that exchange materials with their environment?

Accepted Answer

As a cell increases in size, its volume grows faster than its surface area, limiting the rate at which substances can cross the plasma membrane.

Question 5

Which organelle is primarily responsible for producing ATP through chemical energy conversion in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 6

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

Accepted Answer

Plant cell

Question 7

Which of the following best describes the function of the endomembrane system in eukaryotic cells?

Accepted Answer

It synthesizes proteins, transports proteins to membranes and organelles, and detoxifies poisons.

Question 8

During protein synthesis, what is the role of ribosomes attached to the rough endoplasmic reticulum (RER)?

Accepted Answer

They synthesize proteins destined for secretion, insertion into membranes, or for specific organelles.

Question 9

Which process allows researchers to separate specific cell components in bulk and identify their functions?

Accepted Answer

Cell fractionation

Question 10

A mutation causes a cell to lack nuclear pores. Which cellular process would be most directly affected?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm

Question 11

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

Accepted Answer

Sorting, modifying, and shipping proteins and lipids to their destinations

Question 12

Which statement about the structure of the plasma membrane is correct according to the fluid mosaic model?

Accepted Answer

Proteins are embedded within a lipid bilayer, allowing for selective permeability.

Question 13

Which of the following best describes the difference between free ribosomes and bound ribosomes?

Accepted Answer

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

Question 14

A cell is placed in a hypotonic solution. What will happen to the cell?

Accepted Answer

Water will move into the cell, causing it to swell.

Question 15

Which of the following is a real-world example of the importance of surface area to volume ratio in human physiology?

Accepted Answer

Intestinal cells have microvilli to increase surface area for nutrient absorption.

Question 16

Which organelle contains its own DNA and is involved in converting light energy to chemical energy?

Accepted Answer

Chloroplast

Question 17

Which of the following best describes the function of smooth endoplasmic reticulum (SER)?

Accepted Answer

Synthesizes lipids, metabolizes carbohydrates, detoxifies drugs and poisons, and stores calcium ions

Question 18

A cell is observed to have a high number of lysosomes. What is the most likely function of this cell?

Accepted Answer

Digestion and breakdown of macromolecules

Question 19

Which of the following statements about the nuclear envelope is correct?

Accepted Answer

It is a double membrane (lipid bilayer) perforated by pores that regulate entry and exit of molecules.

Question 20

Which of the following best explains why most secretory proteins are glycoproteins?

Accepted Answer

Carbohydrate groups attached to proteins help with recognition and targeting to specific destinations.

Cell Structure and Function: Microscopy, Cell Types, and Membrane Systems

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