A toxin that is part of the bacterial cell is
A. A cytotonic toxin
B. a cytotoxin
C. an exotoxin
D. an endotoxin
Ans: D. an endotoxin
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Why is it important to include a placebo in a scientific study to assess the effectiveness of a drug?
A. It's actually unethical to do so-if you have a drug that you know to be effective, it's unethical to withhold that treatment from an ill patient. B. A placebo-treated group will determine if the changes observed in the drug-treated illness group are due to a psychological effect rather than a physiologic/pharmacologic one. C. It isn't scientifically important-a placebo simply helps investigators satisfy the legal requirements of the Food and Drug Administration in their testing process. D. A placebo-treated group will determine if the changes observed in the illness in this non-treated group are due to a physiologic/pharmacologic effect rather than a psychological one.
Growth of new blood vessels is stimulated by vascular endothelial growth factor (VEGF). This ligand binds to the VEGF receptor, which leads to the dimerization and autophosphorylation of this receptor on cytoplasmic tyrosines. What type of receptor is the VEGF receptor?
A. Channel-linked receptor B. Enzymatic receptor C. G protein-coupled receptor D. Steroid hormone receptor
The CRISPR-Cas9 system is a tool to perform
A) exome sequencing. B) DNA profiling. C) pharmacogenetics. D) genome editing.
The cochlea _____. I) amplifies sound vibrations II) collects sound pressure waves III) detects the frequency of sounds
A) only I B) only II C) only III D) only II and III