Question 1

Which of the following best describes the main function of the plasma membrane in a typical human cell?

Accepted Answer

It acts as a selectively permeable barrier, controlling the entry and exit of substances.

Question 2

A scientist observes a cell with an extensive network of membranous sheets and channels, some of which are studded with ribosomes. What is the primary function of this organelle?

Accepted Answer

Protein synthesis and modification

Question 3

Which equation correctly represents the breakdown of hydrogen peroxide by peroxisomes?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 4

A cell is observed to have a large number of mitochondria. What does this imply about the cell’s function?

Accepted Answer

It has high energy requirements.

Question 5

Which structural feature of phospholipids allows them to form a bilayer in the plasma membrane?

Accepted Answer

Their amphipathic nature, with hydrophilic heads and hydrophobic tails

Question 6

Which type of membrane protein is responsible for allowing water and small ions to pass through the plasma membrane?

Accepted Answer

Channel proteins

Question 7

A mutation causes a cell to lack functional lysosomes. Which of the following would most likely result?

Accepted Answer

Accumulation of undigested cellular debris

Question 8

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

Modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles

Question 9

Which of the following is NOT a component of the glycocalyx?

Accepted Answer

Phospholipids

Question 10

A patient’s muscle cells are unable to efficiently produce ATP. Which organelle is most likely malfunctioning?

Accepted Answer

Mitochondrion

Question 11

Which of the following best explains why the plasma membrane is described as 'selectively permeable'?

Accepted Answer

It allows some substances to pass while restricting others.

Question 12

Which organelle is primarily responsible for the synthesis of lipids and detoxification of drugs?

Accepted Answer

Smooth endoplasmic reticulum

Question 13

Which of the following is a function of microvilli on the surface of epithelial cells?

Accepted Answer

Increase surface area for absorption

Question 14

Which of the following gases is required by mitochondria for ATP production, and which gas is produced as a result?

Accepted Answer

Oxygen is required; carbon dioxide is produced.

Question 15

Which of the following best describes the cytoskeleton?

Accepted Answer

A network of proteins that provides structural support and framework for the cell

Question 16

Which of the following is a correct distinction between cytosol and cytoplasm?

Accepted Answer

Cytoplasm includes cytosol and organelles, while cytosol is the fluid portion inside the cell membrane.

Question 17

Which of the following is a function of the nucleolus?

Accepted Answer

Synthesis of ribosomal RNA (rRNA)

Question 18

A cell is observed to have an abundance of rough endoplasmic reticulum. What is this cell most likely specialized for?

Accepted Answer

Protein synthesis

Question 19

Which of the following best describes the role of carrier proteins in the plasma membrane?

Accepted Answer

They bind specific molecules and transport them across the membrane.

Question 20

Which of the following is a real-life example of cellular differentiation?

Accepted Answer

A stem cell developing into a red blood cell

Cellular Level of Organization: Structure and Function of Cells and Their Organelles

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