In early spring 2009, the CDC reported several dozen cases of novel H1N1 influenza ("swine flu") in the United States. By the summer, the number of confirmed cases was reported as over 40,000. The pattern of novel H1N1 cases in the United States represents a(n) ________ disease
A) epidemic
B) endemic
C) sporadic
D) pandemic
E) opportunistic
A
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Which of the following statements is not true of homologous chromosomes?
1.They contain the same genes at the same loci.
2.They contain the same alleles at the same loci.
3.Typically, one is paternal and one is maternal.
4.They may exchange portions during meiosis.
Name two cellular organelles, each having genetic material, that are involved in either photosynthesis or respiration
What will be an ideal response?
Describe the cancer stem cell hypothesis. How might this explain the inability of traditional cancer treatments such as radiation and chemotherapy to completely eradicate tumors?
What will be an ideal response?
Many kinds of cactus and other desert plants, such as a Euphorbia, are remarkably similar in that they have fleshy plant bodies and spines. Their flower structures, however, show that they are not related. The process considered to be responsible for their similarity in structure is
A. convergent evolution. B. divergent evolution. C. adaptive radiation. D. speciation by polyploidy.