All but which are true about conotoxins?
a. They are potential sources of many new drugs of
medical interest.
b. They are made by snails inhabiting the South
Pacific Ocean.
c. One blocks pain as does morphine but is
nonaddictive.
d. They are not lethal to cone snail prey.
e. They disrupt signals flowing through their
nervous system.
Answer: d
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Which of the three cytoskeletal fibers contribute to the structural integrity and strength of epithelial tissues in animals?
A. intermediate filaments and microfilaments B. intermediate filaments and microtubules C. microtubules and microfilaments
Natural sources of energy on the early Earth caused ____
a. spontaneous genetic mutations b. chemical bonds to break c. chemical bonds to form d. chemical bonds to break and form e. spontaneous genetic mutations and chemical bonds to break and form
Sexual reproduction introduces more genetic variation than does asexual reproduction.
Answer the following statement true (T) or false (F)
Pollen release is indicated by
a. A. b. B. c. C. d. D. e. E.