In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant
The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the rodent populations following the accident? A) Mutations caused major changes in rodent physiology over time.
B) Mutation led to increased genetic variation.
C) Mutation caused genetic drift and decreased fitness.
D) Mutation caused the fixation of new alleles.
B
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Which conclusion do the data best support?
1.one year is an adequate time frame to show the effects of treatment on fire ant populations
2.fire ant populations develop resistance to pesticides
3.fire ant populations have natural ups and downs
4.fire ants are long-lived organisms
Mismatch repair targets improperly paired nucleotides. In prokaryotes, the incorrect member of an abnormal base pair can be differentiated from the correct member because
A) the incorrect member has undergone a hydroxylation reaction. B) newly synthesized DNA contains uracil. C) the incorrect member doesn't match the surrounding bases. D) the original strand of DNA contains methylated bases while newly synthesized DNA does not; thus the correct member is in the methylated strand. E) the correct member has been deaminated.
The function of which of the following organelles directly requires oxygen?
A. Ribosome B. Mitochondrion C. Nucleus D. Centriole E. Golgi apparatus
What organism produces cysts that contaminate food and water and cause amebic dysentery?
a) Cyclospora cayetanensis b) Giardia lamblia c) Entamoeba histolytica d) Aspergillus flavus