Cyanide acts quickly, and can cause death, by blocking:
What will be an ideal response?
The transfer of electrons to oxygen in the final step of aerobic respiration
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During the recovery period between action potentials,
a. the threshold value is increased. b. the threshold value is reduced. c. the sodium gates are shut and the potassium gates are opened. d. both the sodium and the potassium gates are shut. e. the nerve is said to be at the resting potential.
All of the following can pass through a healthy placenta EXCEPT which one?
A) water B) nutrients C) oxygen D) some antibodies E) blood cells
Scientists can induce, or cause, mutations in DNA in a laboratory setting. What evidence would best support a scientist's claim that a certain mutation induced in a lab would have no phenotypic effect if it occurred in an actual organism?
A) The mutation affects an entire chromosome. B) The mutation is an insertion mutation. C) The mutation is in a gene that codes for an essential protein. D) The mutation does not change the protein generated by this gene
Chagas' disease is transmitted by a bug with mouthparts that penetrate blood vessels. Which type of exposure does this represent?
A) mucous membrane portal B) parenteral route C) skin portal D) contact E) fomite