Which of the following types of radioactive particle has the highest LET?
a) Alpha particle
b) x-ray
c) gamma-ray
d) proton
Answer: a) Alpha particle
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What molecular mechanism/feature does site-directed mutagenesis exploit to introduce a mutation at a specific site?
A) flanking complementary bound nucleotides permit non-complementary base pairing B) methylated nucleotides disrupt DNA polymerase's proofreading C) nucleotide substitution when one is depleted D) transposase-induced base pair changes
In the biochemical oxygen demand (BOD) test, the factor that should limit biological activity is ________.
A. phosphorus B. carbon C. nitrogen D. oxygen
Mitotic activity by the apical meristem of a root makes which of the following more possible?
A) increased delivery of water to the aboveground stem B) decreased absorption of mineral nutrients C) increased absorption of carbon dioxide. D) effective lateral growth of the stem
Viral infections are easier to treat with drugs than bacterial infections.
Answer the following statement true (T) or false (F)