The following are steps in using SSU rRNA molecules to develop phylogenetic trees. Place these steps in the correct order.1. Isolate DNA from cells of each organism being tested.2. Amplify the DNA of the SSU rRNA genes of each organism using polymerase chain reaction. 3. Determine the nucleotide sequence of the SSU rRNA genes of each organism.4. Align nucleotide sequences to compare.5. Count the number of nucleotide differences between each pair of sequences and calculate the evolutionary distance.6. Input data into computer and use appropriate software to construct a phylogenetic tree.
Fill in the blank(s) with the appropriate word(s).
1, 5, 3, 4, 6, 2
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Which of the following evolution-related events is in the correct cause-and-effect sequence?
a. mutation ? variation ? natural selection ? adaptation ? speciation b. variation ? adaptation ? mutation ? natural selection ? speciation c. speciation ? adaptation ? variation ? mutation ? natural selection d. mutation ? speciation ?adaptation ? variation ? natural selection e. natural selection ? variation ? mutation ? adaptation ? speciation
Why are viruses not considered to be alive? What will be an ideal response?
Forty-nine percent of a population is homozygous dominant for a particular trait. According to the Hardy-Weinberg law, the gene frequency of this dominant allele will be
A. 0.24. B. 0.49. C. 0.70. D. 0.9.
Which of the following statements is incorrect concerning the use of drug therapy in an HIV-positive patient?
A) Reverse transcriptase inhibitors can help to slow the virus from entering into host chromosomes. B) Protease inhibitors can slow the assembly of new viruses. C) If drug therapy is used in a confirmed HIV-positive patient, all HIV viruses can be successfully eliminated from the body. D) Two or more drugs can be combined to form a "drug cocktail."