Which one of the following statements CORRECTLY describes the architecture of a plasma membrane?
A) Proteins line the internal, cytoplasmic surface, and phospholipids cover the external surface.
B) Proteins, phospholipids, and cholesterol are joined by strong covalent bonds that give the membrane strength.
C) Phospholipids line the internal cytoplasmic surface, and proteins cover the external surface, sandwiching cholesterol in the middle.
D) Proteins and cholesterol are embedded in the phospholipid bilayer, forming a fluid mosaic.
D
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Which of the following hemolysins is a phospholipase?
A) lecithinase B) Streptolysin-O C) Staphylococcal -toxin D) leukocidin
Four of the five answers listed below are sources of variation in a population. Select the exception
a. mutation b. sexual reproduction c. crossing over d. independent assortment e. law of dominance
Knowing the ion concentrations on both sides of the plasma membrane makes it possible to calculate the membrane potential (Vm), because at equilibrium
A) the Faraday constant is 0. B) ?G is 1. C) ?G is 0. D) the Vm is always -60 mV. E) It is not possible to calculate Vm without also knowing the uncharged solute distribution across the membrane.
Helicase
A. supercoils DNA. B. unwinds DNA. C. unwinds RNA. D. winds RNA.