Fluorescence microscopy has been helpful in observing:
A. attachment of pollen grains to the anther
B. pollen tube development in the style
C. time involved in pollen release from anthers
D. location of pollen within the anther
E. The size of pollen grains
B. pollen tube development in the style
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An example of an inhibitory neurotransmitter is
A) acetylcholine. B) epinephrine. C) dopamine. D) GABA. E) insulin.
Sickle-cell anemia has been traced to what type
of mutation?
a. frameshift b. base-pair substitution c. mutagenic d. transposable element e. viral
Radioactive dating techniques have demonstrated that Earth was formed approximately ________ years ago
A) 10 billion B) 46 million C) 4.6 million D) 4.6 billion
The search for a(n) ____ treatment led to the discovery that DNA carries genetic information
a. pneumonia b. AIDS c. tuberculosis d. influenza e. SARS