Chapter 7: Membrane Structure and Function

What statement about a typical plasma membrane is correct?
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What statement about a typical plasma membrane is correct?
The two sides of the plasma membrane have different lipid and protein composition.
The presence of cholesterol in the plasma membranes of some animals
enables the membrane to stay fluid more easily when cell temperature drops.
In order for a protein to be an integral membrane protein it would have to be
amphipathic, with at least one hydrophobic region.
Water passes quickly through cell membranes because
it moves through aquaporins in the membrane.
What factors does not affect membrane permeability?
The polarity of membrane phospholipids
How can a lipid be distinguished from a sugar?
Lipids are mostly nonpolar.
True or false? Osmosis is a type of diffusion.
True
What property of dishwashing liquid (detergent) makes it useful to wash grease from pans?
Amphipathic nature
What particle could diffuse easily through a cell membrane?
Oxygen (O2)
True or false? The water-soluble portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group.
True
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?HypotonicThe solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.IsotonicA patient was involved a serious accident and lost a large quantity of blood. In an attempt to replenish body fluids, distilled water-equal to the volume of blood lost-is added to the blood directly via one of his veins. What will be the most probable result of this transfusion?The patient's red blood cells will swell and possibly burst because the blood has become hypotonic compared to the cells.For a protein to be an integral membrane protein, it would have to be _____.amphipathic, with at least one hydrophobic regionWhy are lipids and proteins free to move laterally in membranes?There are only weak hydrophobic interactions in the interior of the membrane.Which of the following is a characteristic feature of a carrier protein in a plasma membrane?It exhibits a specificity for a particular type of molecule.What kinds of molecules pass through a cell membrane most easily?small and hydrophobicWhen a cell is in equilibrium with its environment, which of the following occurs for substances that can diffuse through the cell?There is random movement of substances into and out of the cell.Active and passive transport of solutes across a membrane typically differ in which of the following ways?Active transport always involves the utilization of cellular energy, whereas passive transport does not require cellular energy.