exam #2

the force driving simple diffusion is ________, while the energy source for active transport is .....

• concentration gradient; ADP

• concentration gradient; ATP

• transmembrane pumps; electron transport

• phosphorylated protein carriers; ATP

after an hour, a freshwater unicellular eukaryote that has been dropped into sea water will be...

• swollen

• plasmolyzed

• unchanged

• there is no way toknow

membranes that are rich in UNsaturated fatty acids __________ than those rich in saturated fatty acids.

• more fluid

• less fluid

the function of membrane proteins are/is

• transport

• cell-cell recognition

• signal transduction

• all of the above

which of the following would not pass through the plasma membrane by simple diffusion?

• carbon dioxide

• oxygen

• simple hydrocarbons

• starch

the tendency for molecules to spread out evenly from high concentration to low concentration is known as...

• diffusion

• plasmolyed

• active diffusion

• faciliated diffusion

passive transport requires atp to make it happen

• true

• false

transport through a membrane that requires the use of membrane protein is known as

• Active diffusion

• facilitated diffusion

• diffusion

which molecule will diffuse directly across a lipid bilayer?

• sucrose

• O2

• glucose

• NA+

cells that secrete (release) substances used the process of endocytosis to release their products

• true

• false