Cell Membrane Quiz

What model describes the structure of the cell membrane?

• Lock and Key

• Fluid Mosaic

• Sandwich

• Lipid-Water

Why is the cell membrane considered a mosaic?

• It is composed of a single type of molecule

• It is made up of many different kinds of molecules

• It is composed of only water and proteins

• It is constantly changing its composition

Which part of the phospholipid is hydrophilic?

• Tail

• Head

• Both head and tail

• Neither head nor tail

The hydrophobic region of a phospholipid is:

• The tail

• The head

• Both head and tail

• The extracellular fluid

What type of molecules are embedded within the phospholipid bilayer?

• Water molecules

• Proteins and cholesterol

• Sugars and salts

• DNA and RNA

What is the main function of cholesterol in the cell membrane?

• To store energy

• To transport materials

• To support membrane structure

• To break down nutrients

Which of the following proteins is involved in identifying the cell?

• Receptor proteins

• Channel proteins

• Carrier proteins

• Cell-identity markers

Which of the following is NOT a function of the cell membrane?

• Barrier

• Sensitivity

• DNA replication

• Support

What does it mean when a membrane is selectively permeable?

• It allows all substances to pass through

• It only allows large molecules to pass through

• It allows some substances to pass through and restricts others

• It blocks all substances from entering

What process involves molecules spreading from an area of high concentration to low concentration?

• Osmosis

• Facilitated diffusion

• Simple diffusion

• Active transport