Question 1

Which of the following statements best describes the Fluid Mosaic Model of the cell membrane?

Accepted Answer

It is a selectively permeable lipid bilayer with proteins embedded and dispersed throughout.

Question 2

A scientist is using electron microscopy to study the ultrastructure of a cell. Compared to light microscopy, what is the main advantage of electron microscopy?

Accepted Answer

It can magnify cellular structures up to 2 million times, revealing details not visible with light microscopy.

Question 3

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

Accepted Answer

It regulates the movement of certain substances while restricting others based on size, charge, and solubility.

Question 4

Which of the following is a function of integral proteins in the cell membrane?

Accepted Answer

They are embedded in the lipid bilayer and can function as channels or transporters.

Question 5

A mutation causes a cell to lack functional gated channels in its membrane. Which of the following is a likely consequence?

Accepted Answer

The cell will lose the ability to regulate the movement of specific ions and water across the membrane.

Question 6

Which of the following best distinguishes somatic cells from sex cells in the human body?

Accepted Answer

Somatic cells make up most of the body's tissues and organs, while sex cells are specialized for reproduction.

Question 7

Which of the following statements about cellular diversity is correct?

Accepted Answer

There are approximately 200 different cell types in the human body, each specialized for specific functions.

Question 8

A researcher is studying the movement of sodium ions across a cell membrane. Which membrane component is most directly involved in this process?

Accepted Answer

Integral protein channels

Question 9

Which of the following best describes the role of peripheral proteins in the cell membrane?

Accepted Answer

They are attached to the membrane surface and can detach without disrupting the membrane structure.

Question 10

Which of the following is NOT a part of the cell theory?

Accepted Answer

Cells can spontaneously generate from non-living matter.

Question 11

A patient has a genetic disorder that affects the structure of their cell membranes, making them less fluid. Which of the following is a likely effect?

Accepted Answer

Decreased ability of membrane proteins to move and function properly.

Question 12

Which of the following best explains why DNA is found in both the nucleus and mitochondria of human cells?

Accepted Answer

Mitochondria are inherited from the mother and contain their own DNA, in addition to nuclear DNA.

Question 13

Which of the following scenarios best illustrates the application of cytology in medicine?

Accepted Answer

Using a microscope to identify abnormal cell structures in a biopsy sample.

Question 14

A cell is placed in a solution and water begins to move into the cell through the membrane. Which membrane structure is primarily responsible for this movement?

Accepted Answer

Integral protein channels

Question 15

Which of the following best describes the relationship between the structure and function of the cell membrane?

Accepted Answer

The fluid, dynamic nature of the lipid bilayer allows for selective transport and communication.

Question 16

Which of the following is a correct statement about the three main parts of a typical human cell?

Accepted Answer

The cell membrane, cytoplasm, and nucleus each play distinct roles in cell function.

Question 17

A laboratory technician is tasked with distinguishing between integral and peripheral proteins in a cell membrane sample. Which method would best help differentiate these two types of proteins?

Accepted Answer

Testing which proteins can be removed without disrupting the lipid bilayer.

Question 18

Which of the following best explains why gated channels are important for cell function?

Accepted Answer

They allow the cell to regulate the timing and amount of specific ions and molecules entering or leaving the cell.

Question 19

A cell biologist observes that a certain protein is only loosely attached to the exterior of the cell membrane and can be easily removed without disrupting the membrane. This protein is most likely:

Accepted Answer

A peripheral protein

Question 20

Which of the following best describes the main difference between light microscopy and electron microscopy in the study of cells?

Accepted Answer

Electron microscopy provides much higher magnification and resolution than light microscopy.

Cell Structure and the Plasma Membrane: Foundations of Anatomy & Physiology

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