Having a mutation in some mitochondrial chromosomes but not others is called
A) heterogamy.
B) heteroplasmy.
C) heterogeneity.
D) heterozygosity.
B) heteroplasmy.
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Which of the following statements best describes DNA polymerase?
A. It is an enzyme required to produce a primer needed for DNA replication. B. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. C. It is an enzyme that requires the presence of a small double-stranded nucleic acid primer to catalyze the addition of nucleotides to the 3? end of a growing DNA strand. D. It is an enzyme required to glue pieces of DNA fragments together. E. It is an enzyme that polymerizes to the DNA and keeps the replication fork open.
Which of the following is part of the innate immune response?
a. antibodies b. vaccines c. natural killer cells d. T cells and B cells
All of the following are adaptations of diving marine mammals for extended submersion times except:a
breathing in an extra supply of oxygen before a dive. b. high concentrations of myoglobin. c. greater blood volume per unit mass, compared to nondiving mammals. d. a larger than typical spleen. e. the collapse of lungs at fairly shallow depths.
Pyramids of numbers are of limited usefulness because they:a
do not indicate the biomass of the organisms at a given time. b. do not indicate the gross primary productivity of each species. c. do not include energy flow through the ecosystem. d. include three trophic levels. e. have limited reliability of the actual numbers involved.