Many birds, such as seagulls which rarely drink fresh water, deal with the osmotic stress of taking in
large quantities of salt in their food mainly by
a. active transport of ions into the body through their feet.
b. excreting nitrogenous wastes through their kidneys as urea.
c. active transport of ions out of the body by chloride cells.
d. excreting excess salt through the actions of specialized salt glands in their heads.
e. maintaining high levels of urea and trimethylamine oxide in body fluids.
D
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Which of the following statements is not true of the formation of N-formylmethionyl-tRNAfMet?
A. It is formed in two successive reactions. B. A formyl group is transferred to methionine before it is added to tRNAfMet. C. The transformylase enzyme most likely recognizes a unique structural feature of tRNAfMet. D. The tRNAfMet is charged by the Met-tRNA synthetase.
Reptiles are ectotherms, so they cannot generate their own body heat. Which of the following is an adaptation, similar to hibernation, that allows reptiles to survive periods where temperatures are cold?
a. cryptobiosis b. diapause c. brumation d. aestivation
Which of the following statements concerning leucine zipper proteins is FALSE?
a. They are transcription factors. b. They contain loops held together by zinc ions. c. They form homodimers. d. They form heterodimers. e. They contain DNA-binding domains.
As part of your research project, you travel to an island to learn more about the habitats and relationships of spiders, centipedes, and insects. You and your assistant plot out five different areas of the island and count the numbers of spiders, centipedes, and insects living in each plot. Your results show the following: Plot Insects Spiders Centipedes1300254242617103147152147397805791393The plots that were staked out on the island were part of the
A. basic research. B. experimental design. C. constructed model. D. applied research.