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9. GTPases are regulated by Guanyl exchange factors (GEFs), because GEFs (A) catalyze the dephosphoryaltion of GTPase proteins (dephosphorylation of specific amino acids). (B) catalyze the phosphorylation of GTPase proteins (phosphorylation of specific amino acids). (C) result in enhanced binding of guanosine triphosphate (GTP) to the GTPase. (D) result in enhanced binding of guanosine diphosphate (GDP) to the GTPase. (E) can function either to control GTP binding or phosphorylation of proteins. 10. Which of the following best describes the function of the centriole? The centriole 11. Which of the following was initially derived from jellyfish?
4 12. Which of the following would enhance resolution (i.e. allow imaging with a lower resolution limit)? 13. Fluorescence involves which of the following: (A) Fluorescence involves the formation of a new covalent bond upon absorbance of exciting light, such that this covalent bond always remains after the fluorescent light has been emitted. (B) Fluorescence involves the transition of an electron to a higher energy state upon excitation with light of a specific wavelength, which rapidly results in emission of light of a lower wavelength. (C) Considering both excitation and emission phases, fluorescence involves a reaction that has an overall net positive ΔG.(D) Fluorescence involves the emission of light of a higher wavelength than the excitation light. (E) all of the above.