The shortest time required to kill all the microbes in a sample at a specified temperature is called the
A. thermal death point (TDP).
B. sporicidal time.
C. thermal death time (TDT).
D. death phase point.
Answer: C
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Which of the following is NOT a piece of genetic evidence that supports the "out of Africa" hypothesis for the origin of humans
A. mtDNA seqeunces from African and Non- African samples indicates a divergence time of approximately 200,000 years. B. Genetic diversity of mtDNA sequences among African samples is greater than genetic diversity of mtDNA sequences among Non-African samples. C. mtDNA alleles present in Europe are a sub -set of mtDNA alleles derived from those present in Africa. D. mtDNA alleles among samples from Africa are more similar than mtDNA alleles among samples from Europe
The cell walls of plant cells and prokaryotic cells are structurally identical
a. true b. false
A Neurospora mutant that is a tryptophan auxotroph does not need to be grown on a medium that contains tryptophan
Indicate whether the statement is true or false
A hydrogen atom that has become an ion is
a. a negatively charged ion. b. an isotope. c. unstable. d. a proton. e. an electron