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Terms in this set (16)
Which of the following factors does not affect membrane permeability?
The polarity of membrane phospholipids
How can a lipid be distinguished from a sugar?
Lipids are mostly nonpolar.
What property of dishwashing liquid (detergent) makes it useful to wash grease from pans?
Amphipathic nature
Which of the following particles could diffuse easily through a cell membrane?
Oxygen (O2)
If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?
Hypotonic
Which of the following statements is TRUE with regard to this animation?
Both sodium and potassium ions are transported against their concentration gradients.
Which of the following molecular movements is due to diffusion or osmosis?
When a plant cell is placed in concentrated salt water, water moves out of the cell.
Which statement is correct?
The contents of a red blood cell are hypertonic to distilled water.
Select the correct statement about osmosis.
Osmosis is the diffusion of water molecules across a selectively permeable membrane.
Based on the figure given below, which of these experimental treatments would increase the rate of sucrose transport into the cell?
decreasing extracellular pH
Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because __________.
they amplify the original signal manyfold
Lipid-soluble signaling molecules, such as testosterone, cross the membranes of all cells but affect only target cells because __________.
intracellular receptors are present only in target cells
A protein that spans the phospholipid bilayer one or more times is
a transmembrane protein.
Which of the following factors would tend to increase membrane fluidity?
a greater proportion of unsaturated phospholipids
In what way do the membranes of a eukaryotic cell vary?
Certain proteins are unique to each kind of membrane.
The difference between pinocytosis and receptor-mediated endocytosis is that
pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity.
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