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PSL 310 Membrane Transport Study Questions
Terms in this set (42)
Which of the following is correctly matched?
large polar molecules- use carriers to move through the cell membrane
Which of the following is correctly matched?
phospholipid molecules- bilayer, framework of the cell membrane; proteins- carriers, enzymes, receptors; carbohydrate- outer surface, cell type identification; cholesterol- between phospholipid molecules
In order for molecules (O2) to diffuse through the cell membrane, the cell is required to use its own energy in the form of ATP.
false- O2 is non-polar and can diffuse through the lipid bilayer
Carrier mediated transport down a concentration gradient is called ____.
Osmosis requires a _____ membrane and solute concentrations _____ on the 2 sides of the membrane.
Which of the following affects the movement of electrolytes through cell membranes?
electrical gradient and concentration gradient
After Tm (transport maximum) for a molecule is reached, an increase in the molecules concentration outside of the cell ____ increase the rate of movement of the molecule into the cell.
Competition, saturation, and specificity occur in active transport, but not facilitated diffusion.
In which graph above is the molecule transported by simple diffusion?
graph A- straight line
carrier mediated- levels off
If a cell is placed in a hypertonic solution, it will____.
During osmosis, water moves from an area of higher water concentration to an area of lower concentration.
_____ molecules make up their framework of the cell membrane, with their ____ facing water and their _____ making up the interior of the membrane.
phospholipid, polar heads, non polar tails
Large, non polar molecules go through the cell membrane by which of the following routes?
through the lipid bilayer
Which of the following forms channels (or "pores") in the cell membrane?
In an experiment, you observe that when the extracellular concentration of a certain amino acid is increased, the net movement into the cell of a different amino acid is decreased. This observation is best explained by which of the following characteristic of carrier mediated transport listed?
The type of vesicular transport in which a white blood cell brings a bacterium (bacterial cell) into the blood cell is which of the following?
A cell placed in an isotonic solution will ____.
stay the same
Which of the following uses ATP energy?
Carrier molecules in the cell membrane are ___.
Which below are the molecules which make up the framework of the cell membrane?
From the choices listed, which would be most likely to move through the cell membrane (into or out of the cell) by moving through pores in the membrane?
small ions (K+, Na+, Cl-, H2O
Which of the choices listed is NOT correctly matched?
diffusion- requires ATP breakdown
If a cell is placed in a ____ solution, it will swell.
During osmosis, water moves from an area of ____ concentration to an area of _____ concentration.
high water; low water
Saturation (and a transport maximum or Tm) occurs in _____.
facilitated diffusion and active transport
The pressure necessary to stop osmosis into a solution is equal to the osmotic pressure of the solution.
Which type of vesicular transport below transports substances from inside the cell to outside the cell?
Receptor molecules in the cell membrane are _____.
In the fluid mosaic model of the membrane, there are fluid _____ (which makes up the framework of the membrane, and can laterally (sideways) move, in the membrane) and a mosaic of _____ (some are on the outer or inner surface, and some go all the way through the membrane).
Which of the following must use a carrier to move through the cell membrane?
large polar (charged) molecules
Carrier mediated transport against a concentration gradient is called _____ and it _____ ATP breakdown (energy supplied baby the cell in the form of ATP).
active transport; requires
Which statement concerning or related to diffusion is NOT correct?
in diffusion, there is a net movement of molecules from an area of lower concentration of the molecule to an area of higher concentrations of the molecule
specificity, competition, saturation occur in which of the following?
A semipermeable membrane, which is permeable to water but not to solute, separates a solution from pure water. An increase in the concentration of non-penetrating (non-permeable solute) in the solution will ____ the osmotic pressure.
A cell placed in which of the following solutions would shrink?
Which of the following is correctly matched with the way it would diffuse through the cell membrane?
small ions- diffuse through pores (channels)
The framework of the cell membrane is a double layer (bilayer) of _____.
After Tm for a molecule is reached (that is, after carrier saturation), an increase in the molecules concentration outside of the cell with increase the rate of movement of the molecule into the cell.
Which of the following is carrier mediated transport which does NOT require the cell to use ATP energy?
Which of the following causes a specific molecule to enter the cell?
receptor mediated endocytosis
The movement of electrolytes through cell membranes _____ be affected by an electrical gradient and ____ be affected by a concentration gradient.
can be; can be
The higher the osmolarity of a solution, the higher concentration of ____ in the solution.
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