The major model of vesicle fusion holds that the specificity of a vesicle fusing with its target membrane lies in the interaction of pairs of proteins called v- (vesicle) and t- (target)
a. SNAREs.
b. SNAPs.
c. COPs.
d. NSFs.
Ans: a. SNAREs.
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A control group is to an experiment as _____ is to a clinical trial.
A) a placebo group B) random assignment C) an independent variable D) a literature review
The initiation of transcription in eukaryotes almost always requires activator proteins because:
A. RNA polymerases have little to no intrinsic affinity for promoter sequences. B. RNA polymerases cannot synthesize RNA polymers without association with coactivators. C. promoter sequences are almost always bound by repressor proteins. D. eukaryotic genes exhibit very low gene density.
In which of the following ways are dendrites and axons similar?
A) The presence of branching B) both release neurotransmitters C) both have vesicles D) All of the above
Which of the following characterizes relatively K-selected populations?
A) offspring with good chances of survival B) many offspring per reproductive episode C) small offspring D) a high intrinsic rate of increase E) early parental reproduction