Cell Membrane and Cell Transport Quiz

What is the primary component of the cell membrane?

• Cellulose

• Phospholipids

• DNA

• Ribosomes

The cell membrane is described as "semipermeable" because it:

• Allows all substances to pass freely

• Allows some substances to pass while blocking others

• Is rigid and impermeable

• Is made only of proteins

According to the fluid mosaic model, the cell membrane:

• Is a solid, static layer

• Is made of a rigid mosaic of cellulose

• Is flexible with proteins embedded in a phospholipid bilayer

• Is composed only of lipids

Which molecule helps stabilize the fluidity of the cell membrane?

• Cholesterol

• Glucose

• DNA

• RNA

Simple diffusion involves the movement of molecules:

• From low to high concentration

• Through a protein channel using energy

• From high to low concentration without energy

• By vesicle formation

Osmosis is the diffusion of:

• Oxygen

• Water

• Glucose

• Proteins

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Facilitated diffusion requires:

• Energy in the form of ATP

• Transport proteins to help molecules cross the membrane

• Vesicles to move substances

• No proteins or energy

Active transport differs from passive transport because it:

• Does not require energy

• Requires energy

• Moves substances down their concentration gradient

• Only occurs in plant cells

Which of the following is an example of bulk transport?

• Simple diffusion

• Osmosis

• Phagocytosis

• Facilitated diffusion

Pinocytosis is the process by which a cell:

• Engulfs large particles

• Engulfs fluids and dissolved substances

• Transports molecules through protein channels

• Pumps ions against the concentration gradient