Which of the following is not characteristic of neurotransmitters?
a. They are released in response to calcium ions.
b. They are chemical messengers that signal neurons, muscles, or glands.
c. They are stored within synaptic vesicles.
d. They are transported down axons to the synaptic terminals.
e. They move via diffusion across the synaptic cleft
D
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The ras proto-oncogene family is a group of related genes that slow or stop the progression of cancer
a. True b. False Indicate whether the statement is true or false
MPF becomes active at the end of Gap 2.
a. true b. false
The Ames test ____
a. measures UV exposure b. detects Salmonella levels c. found there is a cancer epidemic cause by synthetic chemicals d. found that most cancer-causing chemicals produce mutations e. measures the relationship between viral infections and cancer
Linus Pauling demonstrated that:a
the structure of hemoglobin was altered by a mutation of a single gene. b. mutations only caused defects in enzymes. c. mutations alter the structure of RNA, but not proteins. d. mutations were inherited. e. the structure of hemoglobin was altered by mutations in any of a dozen genes.