Which is (are) the principal substance(s) that
regulate(s) thigmotropism?
a. auxin and ethylene
b. gibberellin
c. abscisic acid
d. salicylic acid
e. none of these
Answer: a
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Which therapy has decreased the incident of pneumocystis infection in patients with human immunodeficiency virus or acquired immunodeficiency syndrome (HIV/AIDS)?
a. Metronidazole b. Trimethoprim-sulfamethoxazole combi-nation c. Aminoglycosides with fluconazole d. Highly active antiretroviral therapy (HAART)
The region in a tRNA molecule that base-pairs with mRNA during translation is the ____
a. anticodon b. aminoacylation site c. TATA box d. cloverleaf e. reading frame
The bulk of a jellyfish consists of
a. mesoderm. b. mesohyl. c. mesophyll. d. mesoglea. e. mesogel.
The fact that plants can be cloned from somatic cells demonstrates that _____
A) differentiated cells retain all the genes of the zygote B) genes are lost during differentiation C) the differentiated state is normally very unstable D) differentiation does not occur in plants