Asymmetry in the structure of the plasma membrane is reflected in
A. differences in the lipid composition on the inner and outler leaflets of the bilayer
B. presence of carbohydrate attached to lipid and protein on the outer surface but not the inner
C. presence of specific kinds of lipid-anchored proteins only on the cytoplasmic surface of the
D. all of the above
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In cells, the g-tubulin ring complex is found
A. in the hollow core of the microtubule
B. at the microtubule (−) end.
C. at the microtubule (+) end.
D. along the outer wall of the microtubule.
All of the following statements describe Kinesin I are true except:
A. Kinesin I is a (−) end-directed motor
B. Kinesin I transports vesicles along microtubules
C. Kinesin I binds and hydrolyzes ATP to produce movement
D. Kinesin I is composed of two heavy chains and two light chains
Which of the following is false regarding the stem cells located in the epithelium lining of the small intestine?
A. They express β-catenin.
B. Lgr5 encodes the R-spondin protein.
C. The Lgr5 gene is induced by Wnt signaling
D. They are located in pits called crypts
Phospholipids with short or unsaturated fatty acyl chains.
A. decrease membrane fluidity
B. increase membrane fluidity.
C. cause biomembranes to become thicker
D. allow hydrophilic molecules to diffuse across the lipid bilayer
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