When a molecule absorbs a photon, one of its electrons is raised to the ________ state
A) energetic
B) quantum
C) positive
D) excited
D
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K+ channels in the heart do not have binding sites for ACh, yet parasympathetic release of ACh causes outward flux of K+ from heart cells. How does this occur?
A. ACh triggers release of epinephrine from the adrenal glands, which in turn causes K+ flux out of heart cells. B. ACh binds to a G-protein coupled receptor on heart cells, and the G protein alpha subunit binds to a separate K+ channel and causes it to open. C. Parasympathetic neurons activate sympathetic neurons, which directly cause K+ flux from heart cells. D. ACh binds and activates a K+ pump on heart cells.
Where are the fungal hyphae in a mycorrhiza?
a. the space between the cell wall and the plasma membrane of root cells. b. in the cytoplasm of root cells. c. on the surface of plant stems, above ground. d. within the vasculature of the leaves of a plant. e. on the outside of the cell wall of root cells.
Fossil fuels develop as a result of complete decomposition of organic matter in swamps and marshes
Indicate whether the statement is true or false
If the two alleles for a particular gene are different the gene pair is
a) homologous. b) heterozygous. c) homozygous. d) dominant. e) recessive.