In many signaling pathways, once a signlaing molecules binds to a receptos, the receptor becomes phosphorylated. This initial phosphorylation step BEST demonstrates...
a) either cellular response or singal transduction
b) cellular response
c) signal transduction
d) receptor activation
e) termination
Ans: e) termination
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The driving force for heart contraction is
a. contraction of the atria. b. contraction of the ventricles. c. closing of the AV valves. d. opening of the AV valves. e. closing of the aortic valve
The dead brown spots on these leaves
are sites where a pathogen invaded and triggered the defensive destruction of surrounding cells. This is an example of which type of defense?
1.activation of heat-shock proteins 2.increased production of terpenes 3.systemic acquired resistance 4.the hypersensitive response________ is the interaction between the products of two genes in which one of the genes modifies the phenotypic expression produced by the other.
Fill in the blank(s) with the appropriate word(s).
Why is snail fever a common name for infections with Schistosoma?
A. The worms look like snails. B. They are contracted by eating snails. C. Snails are the intermediate host. D. Physical contact with snails may result in infection. E. The larval stage looks like a snail.