____ is not a transition seen in going from fish to mammal
Fill in the blank(s) with the appropriate word(s).
Answer: Closure of the internal nares
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Which of the following is the typical mode of transmission for hepatitis C?
A. Bite from body louse B. Contaminated blood and blood products C. Inhalation of droplets D. Contaminated shellfish
Researchers tend to name genes based on what
happens in their absence. The tinman gene in Drosophila results in flies a. without hearts. b. with nonjointed legs. c. with a thick exoskeleton. d. with rust colored eyes. e. without brains.
Which of the following statements about the process of forensic DNA profiling is INCORRECT?
a) After a profile has been done, a complete DNA sequence is often used to verify the results. b) Since the tests are often run on very small biological samples, like drops of blood, PCR reactions are used to amplify the DNA before the profiling begins. c) The technique takes advantage of the fact that portions of the human genome vary greatly throughout the population. d) The results are always given in terms of the probability that two individual's DNA could give the exact same genetic profile. e) All of the above choices are correct.
A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of RNA or DNA. Testing for the presence of which of the following is most appropriate in this situation?
A) phosphate B) nitrogen C) guanine D) uracil E) thymine