Looking at your results of the Ames test using bacteriological agar medium plates lacking the amino acid histidine, you find that there are many colonies growing on the agar. How do you interpret this result?
A. The drug being tested has no inhibitory effect on the bacterium; therefore, it is not a good antibiotic to give for treatment of disease.
B. The chemical being tested is mutagenic.
C. The bacterium has turned its operon genes on, producing proteins necessary for growth.
D. The bacterium does not have any plasmids, so it cannot grow on the medium.
Answer: B
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In base excision repair, a whole segment of DNA is removed and resynthesized
A. true B. false
An organism is classified in the kingdom Plantae. Which of the following must be true about the organism?
a) it reproduces asexually b) it is prokaryotic c) it has cells walls made of chitin d) it is autotrophic
Which property is not used to classify viruses?
A) genome architecture B) tissue types infected C) presence or absence of an envelope D) capsid symmetry E) type of nucleic acid present
Which of the following apply to the demography of human populations today? (Check all that apply.)A) Our ecological footprint is decreasing.B) We are using distributed resources disproportionately-less than 20% of us use over 80% of the energy.C) We have plenty of resources still untouched.D) We use almost half of the Earth's land.E) We use over half of all renewable fresh water sources.
What will be an ideal response?