bio quiz 5.1-5.2

Enzymatic plasma proteins are involved in

• catalyzing metabolic reactions.

• receiving neural impulses from attached nerve cell

• transporting molecules through the plasma membrane

• binding signaling molecules to initiate physiological changes in the cell.

The plasma membrane is selectively permeable, allowing ______ substances to cross.

• no

• all

• some

Which direction do the hydrophilic heads of the phospohlipid bilayer point?

• Only towards the outside of the membrane

• Towards the interior of the bilayer

• Only towards the inside of the membrane

• Towards the water on the outside and inside of the membrane

Which features enable carbon dioxide molecules to pass through the plasma membrane?

• They are in a low concentration

• They do not contain a charge

• They are small

• They are very large

• They are nonpolar

What feature is found in both glycolipids and glycoproteins?

• They have attached lipid chains

• They have attached protein chains

• They have attached nucleic acid chains

• They have attached carbohydrate chains

Which portion of the phospholipid bilayer will associate with the water within the cytoplasm?

• hydrophilic tails

• hydrophilic heads

• hydrophobic tails

• hydrophobic heads

Select the components of the plasma membrane as described by the fluid-mosaic model.

• phospholipids

• water

• proteins

• nucleic acids

• cholesterol

Proteins that are involved in passive transport of molecules through the cell membrane are called ______ proteins.

• receptor

• junction

• cell recognition

• channel

Which type of protein changes its shape to allow a specific molecule to pass through the membrane?

• Cell recognition

• Junction

• Carrier

Cell recognition proteins are involved in

• catalysis of metabolic reactions.

• nutrient recognition and transport.

• the immune response.

• sending signals into the cell.