Which of the following classes of microbes possess both, DNA and RNA in their structure?
A. Prions
B. Viruses/viroids
C. Eukaryotes
D. Prokaryotes
E. Both, eukaryotes and prokaryotes
Ans: E. Both, eukaryotes and prokaryotes
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If you are told that the digestive tract of the animal you are studying developed an anus before a
mouth, you may be looking at: a. an arthropod. b. an animal in which the embryo undergoes radial cleavage. c. an animal in which the embryo undergoes indeterminate cleavage. d. an animal in which the embryo undergoes enterocoely. e. an animal in which the embryo undergoes radial, indeterminate cleavage and enterocoely
Polyploidy as mechanism of speciation occurs most commonly in which of the following?
a) fungi b) plants c) sponges d) polychaete worms e) molluscs
Following anaphase in cell division, the structures produced by the separation of the sister chromatids.
What will be an ideal response?
Fish in a local lake have a mixture of brown and green scales and are found throughout the lake. Over a 5-year period, the lake develops more plant growth and an exotic predatory frog is introduced
What change would you expect to see in the original fish population? A) The fish with green scales will become more common. B) Brown-scaled fish will become more common. C) The fish will develop to resemble the introduced frog. D) No visible changes will occur in the fish population. E) Fish that prefer the unvegetated areas of the lake will become more common.