Which of the following statements about nuclear localization of proteins is not true?
A. Importin ? and importin ? form a cytosolic complex that interacts with proteins containinga nuclear localization signal.
B. Ran-GTP binding is required for the recycling of both importin ? and importin ? back to the cytosol.
C. Ran-GDP is transported from the nucleus to the cytosol.
C
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The Saguaro cactus is a large cactus found in some southwestern desert environments. It plays
a central role in providing habitat for a variety of other species, and if these cacti die or are removed from the ecosystem, biodiversity declines. Thus, the Saguaro cactus is a __________.
a. keystone species b. tertiary consumer c. generalist d. trophic level
Deep-diving animals accomplish their dives
through all of the following means EXCEPT by a. redirecting blood flow. b. conserving energy by gliding rather than swimming. c. relying primarily on anaerobic respiration during deep dives. d. binding oxygen to myoglobin and hemoglobin. e. assuring that the brain has an uninterrupted supply of
Which of the following is NOT true of the chytrids?
a. They belong to the most ancient lineages of fungi. b. Their flagellum is similar to eukaryotes. c. They form non-flagellated spores and gametes. d. They reflect the origin of the fungi in aquatic habitats. e. They are associated with serious diseases in various vertebrates.
What body system allows the survival of different species?
What will be an ideal response?