What is one disadvantage of excreting urea as opposed to uric acid?
a. Urea is more toxic than uric acid.
b. Urea is less toxic than uric acid.
c. Urea is excreted by respiratory structures.
d. Urea requires more water for excretion.
e. Urea is produced from ammonia, not nucleic acids.
d
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. triggers the release of a second messenger which leads to the hydrolysis of glycogen to glucose b. triggers the release of a second messenger which lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
Today, evolutionary biologists view speciation as an event
a. True b. False
After burning your hand on a hot burner, which neurotransmitter will most likely be released from the pain receptors?
a. glutamate b. dopamine
c. substance P d. GABA e. acetylcholine
The cytoskeleton gave rise to the nuclear envelope
a. true b. false