Biology Cell Transport Question Preview (ID: 27354)
Passive And Active Transports.
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Wilting of a plant occurs
a) if the plant is placed in an isotonic solution
b) if there is a rise in turgor pressure
c) as a result of facilitated diffusion
d) when a plant with flexible cell walls is placed in a hypertonic solution
Diffusion occurs
a) only through a lipid bilayer membrane
b) from an area of low concentration to an area of high concentration
c) only in liquids
d) from an area of high concentration to an area of low concentration
A red blood cell will lyse (or burst) when placed in which of the following kinds of solution?
a) hypotonic
b) hypertonic
c) isotonic
d) none of the above
The sodium-potatsium pump is an example of
a) osmosis
b) diffusion
c) facilitated diffusion
d) active transport
The carrier molecules used in active transport are
a) protein
b) carbohydrates
c) calcium pumps
d) lipids
What is the main function of a selectively permeable membrane?
a) Storage of water
b) Storage of chemicals
c) Breaks down molecules within the cell
d) Regulates what enters and leaves the cell
Which of these would be least likely to diffuse across the phosopholipid bilayer of a cell membrane?
a) Water
b) oxygen
c) sodium ions
d) carbon dioxide
The methods of membrane transport that don't require protein channels or carriers are
a) phagocytosis
b) diffusion
c) osmosis
d) all of the choices
Exocytosis is a process by which cells
a) pass substances out of the cell in vesicles
b) pass substances out of the cell through the membrane by osmosis
c) release substances directly into the extracellular fluid through a pore
d) release substances directly into the extracellular fluid through a pit
A lipid bilayer
a) permits water soluble molecules to pass through it
b) facilitates the passage of water soluble molecules through it
c) inhibits the passage of water soluble substances through it
d) actively transports water soluble molecules through it
Substances transported by facilitated diffusion
a) must have movements coupled to those of other substances
b) may flow to a region of higher concentration by the expenditure of energy
c) move passively through specific channels from an area of greater concentration to one of lower concentration
d) are limited to solvents
Active transport is a way for molecules to move across the plasma (cell) membrane. When active transport is used to move molecules, what is required?
a) concentration gradient
b) very small molecules
c) energy that the cell provides
d) osmosis
Which of the following pieces of evidence would suggest that a substance entered a cell via active transport as opposed to passive transport?
a) ATP was required for transport
b) the substance moved from a high concentration to a low concentration
c) the substance moved across the membrane via a carrier protein
d) none of the above
Sugar molecules can enter cells through the process of
a) exocytosis
b) facilitated diffusion
c) osmosis
d) ion pumps
Molecules that are too large to be moved across a cell membrane can be removed from the cell by
a) osmosis
b) endocytosis
c) exocytosis
d) facilitated diffusion
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