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15 Cards in this Set

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  • Back
1.
Which of the following molecules will most easily diffuse across a pure lipid bilayer?
a.
oxygen
b.
glucose
c.
a
proton
d.
a
sodium
ion
e.
a
phospholipid
a
2.
Which of the following statements are true?
a. a eukaryotic cell contains a nucleus while a prokaryotic cell does not
b. the diameter of a typical eukaryotic cell is thousand of times larger than that of a typical prokaryotic cell
c. prokaryotic cells contain a cytoskeleton while eukaryotic cells do not
d. a and b
e. a, b and c
a
3.
Which of the following is not a correct statement about the structure of biological membranes?
a. The lipids bind to each other by covalent bonds.
b. The lipids move freely in the membrane.
c. Some proteins penetrate completely through the lipid bilayer.
d. Some of the proteins move freely in the membrane.
e. The fatty acid chains are in the interior, away from the water.
a
4. Human cells have an electrochemical gradient across the plasma membrane. What is the nature of this gradient?
a. High Na+ outside the cell, positively charged inside the cell.
b. High Na+ outside the cell, negatively charged inside the cell.
c. High K+ outside the cell, positively charged inside the cell.
d. High K+ outside the cell, negatively charged inside the cell.
e. High Na+ outside the cell, positively charged inside the cell.
b
5. An ion channel mediates which of the following forms of transport?
a. facilitated diffusion
b. active transport
c. osmosis
d. fluid mosaicism
e. none of the above
a
6. An isolated human cell is placed in a solution of pure water. This solution is _______
and the cell will ______.
a. hypotonic; burst
b. isotonic; retain its normal volume
c. hypertonic; shrivel
d. hypotonic; shrivel
e. hypertonic; burst
a
7. Which of the following are involved in active transport?
a. Na+K+ ATPase
b. Na+ driven H+ antiport
c. glucose uniport
d. a and b
e. all of the above
d
Tight junctions…
a. hold epithelial cells together
b. prevent solutes from diffusing between epithelial cells
c. maintain the border between the apical and basolateral membranes
d. are made of transmembrane proteins
e. all of the above
e
9. What types of R groups would you expect on a transmembrane segment of a protein?
a. polar
b. charged
c. non-polar
d. cysteine bonds
e. phosphate
c
10. Which of the following statements about archaea are true?
a. archaea are prokaryotes
b. archaea are often found in extreme environments
c. archaea do not have cytoplasmic organelles
d. archaea are distinct from eubacteria
e. all of the above
e
11. Which of the following are not part of the "Cell Theory"?
a. All organisms are made up of cells
b. DNA is the genetic material
c. Cells are the basic unit of life
d. All cells derive from pre-existing cells
e. a and c
b
12. Unsaturated fatty acids…
a. have no carbon double bonds
b. have one or more carbon double bonds
c. have kinks in their hydrocarbon tails
d. have straight hydrocarbon tails
e. b and c
e
13. Which of the following is not part of a phospholipid?
a. fatty acid
b. glycerol
c. cholesterol
d. phosphate
e. hydrophilic head group
c
13. Which of the following is not part of a phospholipid?
a. fatty acid
b. glycerol
c. cholesterol
d. phosphate
e. hydrophilic head group
c
15. Which of the following statements about channels is true?
a. They have a central pore of polar amino acids
b. They are anchored in the hydrophobic bilayer of the plasma membrane
c. They are surrounded by non-polar amino acids
d. They are usually gated
e. All of the above
e