Worksheetsmembranes and transport practice quiz
Total questions: 27
Worksheet time: 56mins
The compounds in biological membranes that form a barrier to the movement of hydrophilic or polar materials across the membrane are
integral membrane proteins
carbohydrates
fatty acids tails of phospholipids
peripheral membrane proteins
Which statement about cholesterol molecules is true?
They help hold a membrane together.
They help stabilize the fluidity of the membrane.
They attach to carbohydrates.
They disrupt membrane function.
If a hospital patient is mistakenly given an IV (inter-venous solution) of pure, distilled water instead of a saline solution that is isotonic to blood, the patient’s red blood cells will
shrink and collapse
release water to their environment along its concentration gradient
absorb water from their environment and eventually burst
transport equal amounts of water across the cell membrane in both directions
What do the brown structures represent?
Phospholipids
Glycoproteins
Integral Proteins
Cyctoskeleton Filaments
What maintains the resting membrane potential in a neuron?
sodium-potassium pumps
sodium channels
potassium channels
gravity
The action potential triggers voltage gated calcium channels to open at the axon terminal. The influx of calcium causes the synaptic vesicles to fuse with the membrane and cause exocytosis to release neurotransmitters into the cleft. The neurotransmitters diffuse across the cleft and fuse with receptor gated ion channels creating a new action potential when ions rush in, depolarizing the membrane. Which transport at the synapse is active transport?
voltage gated calcium channels
exocytosis
diffusion
receptor gated ion channels
Which cell is in a hypertonic environment?
A
B
C
None of them are hypertonic
Assuming that the purple molecules are too large to pass through the membrane, what would happen to the water level as a result of osmosis?
The water level would rise on the A side
The water level would rise on the B side
The water level would remain constant
The water level would drop on the A side.
Which of the following membrane activities requires energy from ATP?
Facilitated diffusion of chloride ions through a chloride channel.
Movement of Na+ ions from lower concentration in a mammalian cell to a higher concentration in the extracellular fluid.
Movement of glucose molecules into a bacteria cell from a medium containing a higher concentration of glucose than inside the cell.
Movement of carbon dioxide out of a paramecium.
An investigator wants to understand whether a newly found membrane protein is involved in membrane transport of a certain particle. Which investigation will help determine whether the new membrane protein is a channel protein involved in passive membrane transport?
Add small nonpolar molecules to the extracellular space and measure the direction of particle movement of the molecules.
Measure the rate of extracellular fluid movement into the cytoplasm.
Add more of the proteins to the plasma membrane and measure the rate of the particle movement.
Remove ATP from the intracellular space and measure the rate of the particle movement into the intracellular space.
A team of biologists develop a new drug, and one team member hypothesizes that the drug is incapable of freely passing across the plasma membrane and requires the help of membrane proteins to enter cells. Alternatively, another biologist on the team hypothesizes that the drug can diffuse passively across the plasma membrane like O2and CO2 can. Which of the following, if true about the drug, best supports the alternative hypothesis that the new drug will exhibit simple diffusion across plasma membranes?
The drug is a small nonpolar molecule.
The drug is a small charged molecule.
The drug is a large polar molecule.
The drug is a large charged molecule
In an experiment, cells were isolated from an aquatic plant and suspended in pond water, a sucrose sugar solution, or distilled water. All of the cells were then viewed under a microscope. Compared with the cell in the pond water, the cell in the sugar solution appeared shriveled, and the cell in the distilled water appeared inflated. The results of the experiment are represented in the diagram.
Which of the following statements best explains the observations represented in this image ?
There was a net movement of sucrose out of the cell suspended in the sugar solution and a net movement of sucrose into the cell suspended in the distilled water.
There was a net movement of sucrose into the cell suspended in the sugar solution and a net movement of sucrose out of the cell suspended in the distilled water.
There was a net movement of water out of the cell suspended in the sugar solution and a net movement of water into the cell suspended in the distilled water.
There was a net movement of water into the cell suspended in the sugar solution and a net movement of water out of the cell suspended in the distilled water.
