A person who inherited the allele combination Aa is ____
a. homozygous dominant
b. homozygous recessive
c. heterozygous
d. codominant
e. dominant
ANSWER: c
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A sequence variant of a gene is called a(n)
A) allele. B) mutation. C) nucleotide polymorphism. D) ribotype.
Nitrification and anammox both
A) create nitrogen gas, but nitrification is aerobic while anammox is anaerobic. B) oxidize ammonia, but nitrification uses O2 and anammox uses NO2- for electron acceptors. C) are aerobic processes, but nitrification produces NO3- and annamox produces N2 gas. D) occur in soils at neutral pH.
In this treatment of bacteria with cold transformation solution followed by heat-shock, the procedure
a. transformed cells. b. nontransformed cells. c. cells that have the gene for resistance to the antibiotic. d. both a and c.
Deeply weathered soils, with no distinct horizons characteristic of the tropical rain forest, are
A) mollisols. B) andosols. C) oxisols. D) alfisols.