Which membrane component is important for allowing large, charged molecules to pass through the membrane?
A. glycosylated lipids
B. carbohydrate channels
C. cholesterol
D. peripheral proteins
E. transmembrane proteins
Answer: E
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If all conditions of Hardy–Weinberg equilibrium are met,
(a) allele frequencies move closer to each generation. (b) allele frequencies change in the direction predicted by natural selection. (c) allele frequencies stay the same. (d) all allele frequencies increase.
The stems and leaves of plants, called the ________, provide a habitat for a wide variety of microorganisms.
A. microbivory B. rhizosphere C. phyllosphere D. plant crust
Once a macrophage ingests a foreign antigen,
the antigen is presented in which of the following manners?
a. embedded directly in the cell membrane of the macrophage b. embedded in the membrane of a transport vesicle and released via exocytosis c. attached to a receptor protein, forming a receptor-antigen complex d. attached to MHC, forming a MHC-antigen complex e. none of these
The concentration of actin monomers at which the rate of polymerization into filaments equals the rate of depolymerization is called the _______ concentration.
a. equilibrium b. critical c. steady-state d. treadmilling e. dynamic