The belief that Homo erectus evolved along different paths in different regions based on local selection
pressures is which model of evolution?
a. classic
b. retroactive
c. multiregional
d. migratory
e. African emergence
C
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The human microbiome is best described as:
A. bacteria associated with the body. B. bacteria and fungi associated with the body. C. bacteria, fungi, and archaea associated with the body. D. viruses that have integrated their genomes into the human genome. E. bacteria, fungi, and archaea that have integrated their genomes into the human genome.
In plants, most chloroplasts are inherited from the maternal plant because maternal gametes contribute the most __________ to the zygote.
A. cytoplasm B. mitochondria C. ribosomes D. chlorophyll E. cytoplasm and mitochondria
Which is true about prokaryotic (bacterial) RNA polymerase?
A. It is used during transcription. B. It does not require a primer. C. It has a detachable subunit, sigma factor, which recognizes the promoter. D. It reads the template in the 3'-5' direction. E. All of the choices are true.
Observe Figure 25.2(a) of your lab manual. The disc in the center of the plate is saturated with a chemical being tested for mutagenic properties. As you know, this chemical has mutagenic properties because there are numerous revertant colonies on the plate. The concentration of the test chemical is highest in areas closest to the disc, and lowest in areas furthest from the disc. Why aren’t there revertant colonies in areas where the test chemical (which causes the reversions) is the greatest?
A) In high concentrations the test chemical is toxic B) In high concentrations the test chemical causes DNA repair C) In high concentration the test chemical causes spontaneous mutations