The microbes commonly known as ________ are single-celled eukaryotes that are generally motile.
A. archaea
B. bacteria
C. fungi
D. protozoa
E. viruses
Answer: D
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Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
A. oxygen B. hydrogen C. carbon D. nitrogen E. sulfur
If you went back to the field site and removed predators from the natural ponds, do you think the results of your field experiments would mirror the results you obtained in the laboratory? Why or why not? a. The field experiment results and lab experiment results would be identical. b. The field experiment results would show higher spot numbers than the labexperiment results
c. The genetic variability in the ponds is limited to low spot numbers, so althoughthere might be high spot numbers after the experiment, they would not be as highas in the lab results.
Aquatic invertebrates excrete , a very toxic waste product, directly into the water.
A. urea B. nucleotides C. uric acid D. ammonia E. allatonin
RNA molecules differ from DNA molecules because only RNA
A. does not have thymine. B. has ribose. C. has uracil. D. is typically one strand of nucleotides. E. All of these choices are correct.