Riftia tube worms contain unusual hemoglobins that bind(s)
A) H2S and O2 in order to transport these chemicals to their bacterial symbionts.
B) high concentrations of O2 produced by their photosynthetic symbionts.
C) sulfate to transport this ion away from their bacterial symbionts.
D) ammonia that their bacterial symbionts produce.
Answer: A
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A patient was suspected of having a rickettsial infection after hiking in the Rocky Mountains. A Weil-Felix test was performed, which resulted in no agglutination observed. Which one of the following statements explains this discrepancy?
a. Detection of rickettsial infections using strains of Proteus is not as specific as other serologic tests; therefore the infec-tions should be retested with a newer me-thod. b. The Weil-Felix test is not the appropriate test to order; it cannot detect cross-reacting antibodies. c. Rickettsial antibodies should be tested using the fluorescent treponemal antibody absorption (FTA-ABS) test, not the Weil-Felix test. d. No discrepancy is present. Rickettsial an-tibodies do not agglutinate with Proteus antigens.
A mixture of DNA fragments is amplified from a sample of ocean water. Which gene(s) could be definitively categorized as originating from a species of animal?
A. Genes for ATP synthase B. Genes for RuBisCO C. Gene for Spongin D. Cell cycle regulatory genes E. Genes for biosynthesis of chitin Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about animal genes? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process ·Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Gal4 is mutated such that it still binds to the DNA but cannot interact with Gal80. What effect would you expect to see in the absence of galactose?
What will be an ideal response?
Nearly all organic substances enter plant cells by ________.
A. Osmosis B. Diffusion C. Symport D. Stomata E. Antiport