Question 1

Which of the following best describes the primary function of the plasma membrane in a eukaryotic cell?

Accepted Answer

It selectively regulates the movement of materials into and out of the cell.

Question 2

A scientist discovers a cell with the following characteristics: a nucleoid region, circular DNA, a cell wall, and no membrane-bound organelles. Which type of cell is this most likely to be?

Accepted Answer

A prokaryotic cell

Question 3

Which of the following structures is responsible for synthesizing proteins that are destined for secretion from the cell?

Accepted Answer

Ribosomes bound to the rough endoplasmic reticulum

Question 4

A mutation prevents the formation of vesicles in a eukaryotic cell. Which process would be most directly affected?

Accepted Answer

Transport of proteins from the endoplasmic reticulum to the Golgi apparatus

Question 5

Which of the following best explains why mitochondria and chloroplasts are considered semi-autonomous organelles?

Accepted Answer

They contain their own DNA and ribosomes and can grow and reproduce within the cell.

Question 6

A cell is observed to have a large number of lysosomes. Which of the following is the most likely function of this cell?

Accepted Answer

Intracellular digestion and recycling of cellular material

Question 7

Which of the following statements about the cytoskeleton is correct?

Accepted Answer

It is a network of protein fibers that helps maintain cell shape and enables movement.

Question 8

A researcher is studying a eukaryotic cell and observes that proteins synthesized on the rough ER are not being properly modified or sorted. Which organelle is most likely malfunctioning?

Accepted Answer

Golgi apparatus

Question 9

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

Accepted Answer

It is the site where ribosomal RNA is synthesized and ribosome assembly begins.

Question 10

Which of the following correctly matches the organelle with its function?

Accepted Answer

Mitochondrion – site of ATP production from organic molecules

Question 11

A cell is exposed to a toxin that specifically disrupts the function of the smooth endoplasmic reticulum. Which process would be most directly affected?

Accepted Answer

Synthesis of phospholipids and steroids

Question 12

Which of the following is a feature unique to prokaryotic cells and not found in eukaryotic cells?

Accepted Answer

DNA located in a nucleoid region

Question 13

A mutation in a plant cell prevents the formation of grana. Which process would be most directly impaired?

Accepted Answer

Photosynthesis

Question 14

Which of the following best explains why eukaryotic cells have compartmentalized organelles?

Accepted Answer

To provide localized environments for specific metabolic processes and sequester incompatible reactions

Question 15

A bacterial cell is observed to have numerous pili. What is the most likely function of these structures?

Accepted Answer

Attachment to surfaces or other cells

Question 16

Which of the following sequences correctly traces the pathway of a secretory protein from synthesis to export from a eukaryotic cell?

Accepted Answer

Rough ER → Golgi apparatus → vesicle → plasma membrane

Question 17

Which of the following best describes the function of chromatin in the eukaryotic nucleus?

Accepted Answer

It is a complex of DNA and histone proteins that packages genetic material.

Question 18

A cell is observed to have a highly folded inner mitochondrial membrane. What is the primary advantage of this structural feature?

Accepted Answer

It increases the surface area for ATP-producing reactions.

Question 19

Which of the following statements about ribosomes is correct?

Accepted Answer

They are composed of rRNA and proteins and are the site of protein synthesis.

Question 20

A cell is unable to recycle its own organelles and macromolecules. Which organelle is most likely defective?

Accepted Answer

Lysosome

Cell Structure and Function: General Biology Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard