Which of the following represents a blind study?
A) The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers.
B) The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do.
C) The test group knows whether they are receiving a placebo or the actual treatment, but the researchers do not know until all the data are collected.
D) Neither the test group nor the researchers know whether the test group is receiving a placebo or the actual treatment until all the data are collected.
B
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What are organized clusters of membrane proteins that selectively allow substances to cross into and out of the nucleus?
a. nuclear pore b. passive transport protein c. receptor d. nuclear envelope e. ribosome
Which of the following distinguishes bacterial
flagella from those of eukaryotes? a. number per cell and structure b. structure and mechanism of movement c. function and mechanism of movement d. number per cell and mechanism of movement e. number per cell and function
During phase I clinical trials, a new drug is tested ________
A) in an animal model B) on fewer than 100 human volunteers C) on a few hundred human volunteers D) on thousands of human volunteers
A new antibiotic is able to bind the rho (?) factor associated with some transcription processes. As a result, this antibiotic would affect
A) initiation of transcription. B) elongation of transcription. C) binding of the RNA polymerase. D) termination of all transcription. E) termination of some transcription.