Which of the two viral phylogenies below shows the signature of a recent rapid population expansion? Justify your answer in one or two sentences
What will be an ideal response?
ANS:
Phylogeny B, as the terminal branches are much longer than the internal branches. Such a "star phylogeny" is characteristic of recent population growth.
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What is the difference between the allosteric and torpedo models of eukaryotic transcritponal termination?
A. The allosteric model is that RNA pol II becomes destabilized after transcription of the poly A signal sequence while the torpedo model is that the polymerase is physically removed from the DNA B. The torpedo model is that RNA pol II becomes destabilized after transcription of the poly A signal sequence while the allosteric model is that the polymerase is physically removed from the DNA C. The allosteric model is that RNA pol II becomes destabilized after transcription of the stop codon sequence while the torpedo model is that the polymerase is physically removed from the DNA D. The torpedo model is that RNA pol II becomes destabilized after transcription of the stop codon while the allosteric model is that the polymerase is physically removed from the DNA E. The only difference between the two models is the proteins that are involved in removing the RNA pol II from the DNA
An individual basidium ultimately produces:
A. eight diploid spores B. four genetically identical haploid spores C. four haploid spores, each genetically different D. eight identical haploid spores E. eight haploid spores, of which there are two each of four different genetic types
What are the three parts that make up the structure of most viruses?
A. Nucleic acid (either DNA or RNA), a capsid, and recognition spikes B. Nucleic acid (either DNA or RNA), a plasma membrane, and recognition spikes C. RNA, a plasmid, and recognition spikes D. DNA, a plasma membrane, and recognition spikes
Henrietta Lack died of
a. cervical cancer. b. breast cancer. c. polio. d. malaria. e. old age