Answer the following statements true (T) or false (F)
1. All diseases caused by Rickettsia spp. are arthropodborne.
2. Viruses contain both DNA and RNA.
3. The cell walls of archaeans contain a thicker layer of peptidoglycan than bacterial cell walls.
4. On entering a bacterial cell, all bacteriophages immediately initiate the lytic cycle.
5. Mycoplasmas cannot grow on artificial media.
1. TRUE
2. FALSE
3. FALSE
4. FALSE
5. FALSE
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What gene is critical for establishment of X-inactivation in mammals?
What will be an ideal response?
Which of the following statements is (are) correct about an oxidation-reduction (or redox) reaction?
A) The molecule that is reduced gains electrons. B) The molecule that is oxidized loses electrons. C) The molecule that is reduced loses electrons. D) The molecule that is oxidized gains electrons. E) Both A and B are correct.
One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. >1,000 Daltons, but <1,500 Daltons B. >5,000 Daltons, but <10,000 Daltons C. >10,000 Daltons D. <1,000 Daltons E. >1,500 Daltons, but <5,000 Daltons
One of the key contributions of the punctuated equilibrium model is that it helps explain
A) why transitional fossils are more common than Darwin would have predicted. B) why transitional fossils tend to be rare and certain common fossil species remain unchanged for long time spans. C) how new species arise from hybridization events. D) why large, widespread populations tend to be the ones that evolve most rapidly and unpredictably.