Question 1

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

Accepted Answer

Eukaryotic cells have a nucleus containing DNA, whereas prokaryotic cells have DNA in a nucleoid region without a surrounding membrane.

Question 2

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

Accepted Answer

Prokaryotic cell

Question 3

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

Accepted Answer

Packaging and modifying proteins for secretion

Question 4

A cell is placed in a hypertonic solution. What is the most likely outcome for the cell?

Accepted Answer

Water will leave the cell, causing it to shrink.

Question 5

Which of the following structures is found in all living cells?

Accepted Answer

Ribosomes

Question 6

The cell wall of most bacteria is composed of which substance?

Accepted Answer

Peptidoglycan

Question 7

Which of the following best explains why viruses are not considered living organisms?

Accepted Answer

They lack cellular structure and cannot reproduce independently.

Question 8

A student is asked to calculate the total magnification of a microscope using an eyepiece lens of 10x and an objective lens of 40x. What is the correct total magnification?

Accepted Answer

$$10 	imes 40 = 400$$

Question 9

Which of the following is a unique feature of fungal cell walls compared to plant cell walls?

Accepted Answer

Fungal cell walls are made of chitin.

Question 10

Which organelle is responsible for breaking down macromolecules and cellular debris in eukaryotic cells?

Accepted Answer

Lysosome

Question 11

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

Accepted Answer

Cell division (mitosis and meiosis)

Question 12

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

Accepted Answer

It is a selectively permeable barrier made primarily of phospholipids and proteins.

Question 13

Which of the following is true about ribosomes?

Accepted Answer

They are the site of protein synthesis in all cells.

Question 14

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

Accepted Answer

It provides structural support and facilitates movement of organelles.

Question 15

A cell is observed to have a double-layered nuclear envelope. How many layers of phospholipids does this envelope contain?

Accepted Answer

$$4$$

Question 16

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

Accepted Answer

Lipid synthesis and detoxification

Question 17

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious agents composed only of protein.

Question 18

Which of the following best explains why gram-negative bacteria are often more resistant to antibiotics than gram-positive bacteria?

Accepted Answer

Gram-negative bacteria have an outer membrane containing lipopolysaccharides that act as a barrier.

Question 19

Which of the following is a correct description of the function of bacterial flagella?

Accepted Answer

They rotate to propel the bacterium using energy from a proton gradient.

Question 20

A cell is observed to secrete digestive enzymes into its environment. Which process is most likely responsible for this secretion?

Accepted Answer

Exocytosis

Cell Structure and Function: General Biology Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard