Question 1

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

Accepted Answer

Smaller cells have a higher surface area to volume ratio, which facilitates efficient exchange of materials with their environment. This ratio is calculated as $$	ext{Surface Area} \div 	ext{Volume}.$$

Question 2

Which structure is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosomes

Question 3

A scientist observes a cell with a nucleoid region, a cell wall, and no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 4

Which organelle is responsible for synthesizing lipids, detoxifying drugs, and storing calcium ions?

Accepted Answer

Smooth endoplasmic reticulum

Question 5

A mutation disrupts the function of the Golgi apparatus in a cell. Which process would be most directly affected?

Accepted Answer

Sorting and packaging of proteins into vesicles

Question 6

Which of the following best describes the function of the cytoskeleton in eukaryotic cells?

Accepted Answer

It provides structural support, facilitates cell movement, and organizes organelles within the cell.

Question 7

Which cytoskeletal element is primarily responsible for separating chromosomes during cell division?

Accepted Answer

Microtubules

Question 8

A freshwater protist uses a contractile vacuole to expel excess water. What is the main function of this organelle?

Accepted Answer

Osmoregulation

Question 9

Which of the following is a function of the central vacuole in plant cells?

Accepted Answer

Maintaining turgor pressure and storing inorganic ions

Question 10

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

Accepted Answer

It is composed of a phospholipid bilayer with embedded proteins, allowing selective passage of substances.

Question 11

Which organelle is the primary site of ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 12

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondria

Question 13

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

Accepted Answer

Producing proteins for export

Question 14

Which of the following best describes the difference between prokaryotic and eukaryotic flagella?

Accepted Answer

Prokaryotic flagella are not made of microtubules, while eukaryotic flagella are composed of microtubules arranged in a 9+2 pattern.

Question 15

Which of the following is a function of microfilaments in eukaryotic cells?

Accepted Answer

They bear tension and are involved in cell movement, such as muscle contraction.

Question 16

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

Accepted Answer

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

Question 17

A mutation causes a cell to lose its ability to synthesize glycoproteins. Which organelle is most likely affected?

Accepted Answer

Rough endoplasmic reticulum

Question 18

Which of the following is a unique feature of plant cells compared to animal cells?

Accepted Answer

Presence of a central vacuole and chloroplasts

Question 19

Which of the following best explains why the DNA in eukaryotic cells is organized into chromatin?

Accepted Answer

Chromatin allows DNA to be efficiently packaged and regulated within the nucleus.

Question 20

Which of the following statements about the endomembrane system is correct?

Accepted Answer

It includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and plasma membrane, which are connected directly or via vesicles.

A Tour of the Cell: Structure, Function, and Diversity

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