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Ch.7 Bio HW/CC Answers
Terms in this set (31)
Which of the following types of molecules are the major structural components of the cell membrane?
phospholipids and proteins
According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?
They can move laterally along the plane of the membrane.
Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures?
The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly.
The presence of cholesterol in the plasma membranes of some animals
enables the membrane to stay fluid more easily when cell temperature drops.
Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?
by increasing the percentage of unsaturated phospholipids in the membrane
In what way do the membranes of a eukaryotic cell vary?
Certain proteins are unique to each membrane.
A protein that spans the phospholipid bilayer one or more times is
a transmembrane protein.
Which of these are not embedded in the hydrophobic portion of the lipid bilayer at all?
Which of the following amino acids would most likely be present in the transmembrane domain of an integral membrane protein?
a hydrophobic amino acid like valine
In a paramecium (a single-celled eukaryote), cell surface integral membrane proteins are synthesized
by ribosomes bound to the rough endoplasmic reticulum.
The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is
to mediate cell-to-cell recognition.
What kinds of molecules pass through a cell membrane most easily?
small and hydrophobic
Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
Water passes quickly through cell membranes because
it moves through aquaporins in 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.
Which of the following statements is correct about diffusion?
It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
Which of the following processes includes all others?
Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?
The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.
When a plant cell is submerged in a hypotonic solution, what is likely to occur?
The cell will become turgid.
Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater?
Water will leave the cells, causing them to shrivel and collapse.
A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water, equal to the volume of blood lost, is transferred directly into one of his veins. What will be the most probable result of this transfusion?
The patient's red blood cells will swell because the blood fluid has become hypotonic compared to the cells.
What is the voltage across a membrane called?
The sodium-potassium pump is called an electrogenic pump because it
contributes to the membrane potential.
White blood cells engulf bacteria through what process?
Once engulfed by a white blood cell, the bacterium will be digested by enzymes contained in the
An animal cell membrane will be more fluid at room temperature if it contains...
More cis-unsaturated and polyunsaturated fatty acids
An oligosaccharide covalently linked to a lipid in the lumen of the rough ER may end up on the...
Extracellular face of the plasma membrane
Which of the following best describes the structure of a biological membrane?
Two layers of phospholipids with proteins either crossing the layers or on the surface of the layers
Which of the following molecules will diffuse most quickly across a lipid bilayer membrane?
Which of the following statements about osmosis is correct?
The presence of aquaporins (proteins that form water channels in the membrane) should speed up the process of osmosis
If a marine algal cell is suddenly transferred from seawater to freshwater, the algal cell will initially...
Absorb water and increase in volume
Recommended textbook explanations
Lehninger Principles of Biochemistry
David L Nelson, Michael M. Cox
Lisa A. Urry, Michael L. Cain, Peter V Minorsky, Steven A. Wasserman
Campbell Biology: Concepts and Connections
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