Cell Membrane Quiz

An educational illustration depicting the structure of a cell membrane with phospholipids, proteins, and cholesterol, highlighting key components and their fun<wbr>ctions.

Cell Membrane Quiz

Test your knowledge of cell membranes with our engaging quiz! Explore essential concepts about the structure, function, and properties of cell membranes through a series of thought-provoking questions.

Key Features:

Multiple choice format
Covers various aspects of cell membranes
Fun and educational

30 Questions8 MinutesCreated by ExploringCell20

Who proposed that the membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids?

H. Davson and J. Danielli

I. Langmuir

C. Overton

S. Singer and G. Nicolson

Which of the following types of molecules are the major structural components of the cell membrane?

phospholipids and cellulose

nucleic acids and proteins

Phospholipids and proteins

Proteins and cellulose

For the following questions, match the labeled component of the cell membrane with its description

The presence of cholesterol in the plasma membranes of some animals

Enables the membrane to stay fluid more easily when cell temperature drops

enables the animal to remove hydrogen atoms from saturated phospholipids.

Enables the animal to add hydrogen atoms to unsaturated phospholipids

Makes the membrane less flexible, allowing it to sustain greater pressure from within the cell.

According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?

They can move laterally along the plane of the membrane

They frequently flip-flop from one side of the membrane to the other.

They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane

They have hydrophilic tails in the interior of the membrane.

Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?

By increasing the percentage of cholesterol molecules in the membrane

By increasing the percentage of unsaturated phospholipids in the membrane

By decreasing the number of hydrophobic proteins in the membrane

By co-transport of glucose and hydrogen

Which of the following is true of integral membrane proteins?

They lack tertiary structure

They are loosely bound to the surface of the bilayer.

They are usually transmembrane proteins

They are not mobile within the bilayer.

Of the following functions, which is most important for the glycoproteins and glycolipids of animal cell membranes?

facilitated diffusion of molecules down their concentration gradients

Active transport of molecules against their concentration gradients

maintaining the integrity of a fluid mosaic membrane

A cellʹs ability to distinguish one type of neighboring cell from another

Which of these are not embedded in the lipid bilayer at all?

Transmembrane proteins

Integral proteins

Peripheral proteins

Integrins

What kinds of molecules pass through a cell membrane most easily?

large and hydrophobic

Small and hydrophobic

large polar

Ionic

Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

Amino acid

K+

Glucose

CO2

Which of the following statements is correct about diffusion?

It is very rapid over long distances.

It requires an expenditure of energy by the cell.

It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

It is an active process in which molecules move from a region of lower concentration to one of higher concentration.

Water passes quickly through cell membranes because

The bilayer is hydrophilic.

It moves through hydrophobic channels

Water movement is tied to ATP hydrolysis.

It moves through aquaporins in the membrane.

Chloride ion channels are membrane structures that include which of the following?

Gap junctions

Aquaporins

hydrophilic proteins

Carbohydrates

Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are

Hypotonic to both fresh water and the salt solution.

Hypertonic to both fresh water and the salt solution.

Hypertonic to fresh water but hypotonic to the salt solution

Hypotonic to fresh water but hypertonic to the salt solution.

When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?

The cell will burst

The cell membrane will lyse

The cell will become flaccid

the cell will become turgid

Which of the following membrane activities require energy from ATP hydrolysis?

facilitated diffusion.

Movement of water into a cell

Na+ ions moving out of the cell

Movement of glucose molecules

What is the voltage across a membrane called?

Chemical gradient

Membrane potential

Osmotic potential

Electrochemical gradient

The sodium-potassium pump is called an electrogenic pump because it

Pumps equal quantities of Na+ and K+ across the membrane.

Pumps hydrogen ions out of the cell.

Contributes to the membrane potential

Is used to drive the transport of other molecules against a concentration gradient.

Ions diffuse across membranes down their

chemical gradients

Concentration gradients

Electrical gradients

Electrochemical gradients

What mechanisms do plants use to load sucrose produced by photosynthesis into specialized cells in the veins of leaves?

Which of the following processes includes all others?

In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis?

On the outside of vesicles

on the inside surface of the cell membrane

on the inside surface of the vesicle

on the outer surface of the nucleus

White blood cells engulf bacteria through what process?

Exocytosis

Phagocytosis

Pinocytosis

receptor-mediated exocytosis

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