What is a source of genetic variation?
A. mutation
B. adaptation
C. replication
D. transcription
Answer: A. mutation
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Many plants are mycorrhizal: Their roots are infected with a specialized fungus. The plant supplies carbon to the fungus, and the fungus supplies nutrients to the plant
The relationship between these plants and the mycorrhizal fungi is an example of a ________ association. A) competitive B) mutualistic C) successional D) predator-prey E) parasitic
Match the following items with the correct phrases.
_______1. The most common member or members of the indigenous microflora of the vagina. _______2. The most common member or members of the indigenous microflora of the skin. _______3. The most common member or members of the indigenous microflora of the mouth. a. a-Hemolytic streptococci b. coagulase-negative staphylococci c. Lactobacillus spp. d. Escherichia coli e. Candida albicans
Evolutionary biologists often use the 16S rRNA gene sequences of prokaryotes to determine genealogical relationships between them. Because these sequences are highly conserved, differences between them are notable and useful for this kind of analysis. While sequencing bacterial endosymbionts from various plants in 1992, results showed that some of these bacteria displayed a lot of similarity in their rRNA sequences, others less, and others very little similarity. The scientists determined that the most likely explanation was that those with the most similarity shared a more recent common ancestor than those with less similarity. Which principle did the scientists use to arrive at this conclusion?
a. conductive reasoning b. natural selection c. maximum parsimony d. proteomics
Curtis's contention that if the last blue whale
were to choke on the last panda bear and it still would not be the end of the world was his way of a. stressing the improper attitude of some environmental activists and to encourage the drilling for oil in Alaska. b. stressing the importance of some bacteria to the biosphere. c. encouraging the study of endangered species. d. shocking an audience into the study of conservation biology. e. doing none of these