Two fundamental concepts about the ion channels of a "resting" neuron are that the channels _____
A) are always open, but the concentration gradients of ions frequently change
B) are always closed, but ions move closer to the channels during excitation
C) open and close depending on stimuli, and are specific as to which ion can traverse them
D) open in response to stimuli, and then close simultaneously, in unison
C
You might also like to view...
How can organisms with the same phenotype have different genotypes and vice versa, and what is the
significance?
What will be an ideal response?In rabbits, there are four alleles at the c locus. Arranged in dominance sequence they are:C
(agouti), cch(chinchilla), ch(Himalayan), and c (albino) (a) Is it possible to cross two agouti rabbits and produce both chinchilla and Himalayan offspring? (b) Is it possible to cross two chinchillas and produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?
An example of a primary sex characteristic is _______.
A. facial hair B. penis C. deeper voice D. all of the above
A microorganism that can use ready-made folic acid from its environment and no longer needs to synthesize it from the PABA precursor demonstrates an example of what type of antimicrobial resistance mechanism?
A) alteration of an enzyme B) alteration of targets C) development of enzymes D) alteration of a metabolic pathway