A phosphatase is capable of dephosphorylating molecules. What would this enzyme do in a signal transduction pathway that used a kinase cascade?
A. Turn off the cascade.
B. Activate the cascade.
C. Phosphorylate a receptor.
D. Serve as a ligand for the receptor.
E. Phosphorylate a transcription factor.
A. Turn off the cascade.
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The difference between a Class I and a Class II tRNA synthetase is:
A. the Class I synthetase requires ATP cofactor and the Class II does not. B. the Class I synthetase uses the 2'-OH of 3' end of the tRNA as a nucleophile and the Class II uses the 3'-OH. C. the Class II synthetase reaction requires a transesterification reaction not necessary in the Class I reaction. D. the Class II synthetases are typically monomeric, whereas the Class I enzymes frequently function as multimeric protein complexes.
Identify the role of carbon dioxide in photosynthesis
A) It is split to become incorporated into sugars. B) It is split to release electrons. C) It is a by-product. D) It is the final electron acceptor.
The lowest concentration of an antimicrobial agen which kills 99.9% of a particular microorganism is the
A. minimum bactericidal concentration B. minimum intermediate concentration C. minimum susceptible concentration D. minimum inhibitory concentration
How does the energy of an electron relate with the distance from the nucleus?
A. The closer an electron is from the nucleus, the greater its energy. B. The farther an electron is from the nucleus, the greater its energy. C. The farther a proton is from the nucleus, the greater the electron's energy. D. The closer a proton is from the nucleus, the greater the electron's energy. E. The closer a neutron is from the nucleus, the greater the electron's energy.