te reactions? owing are enzymes pairs that catalyze opposi a. MEK and MAP kinase
ID: 253758 • Letter: T
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te reactions? owing are enzymes pairs that catalyze opposi a. MEK and MAP kinase b. NF-kappaB and I-kappa B c. PI-3 kinase and PTEN phosphatase d. JAK kinases and STATs e. None of the above Evidence indicating that LDL is internalized by a rece includes 70. a. degradation of LDL in lysosomes inherited mutations in the human population c. surable LDL binding to cells all of the above d. 71. Neurotransmitters are stored in a. The cell body b. The dendrite c. The axon hillock d. Synaptic vesicles 72. Which of the following mechanisms can terminate the intercellular pathway once the concentration of the external signal decreases? a. degradation of the second messenger b. c. deactivation of a signal transduction protein d. e. desensitization of receptors a and b all of the above are correct. Hormones are found in the body in very low concentration, but tend to have a strong effect. What type of receptor are hormones most likely to act on? I. Ligand-gated ion channels II. Enzyme-linked receptors III. G protein-coupled receptor a. I only b. III only c. II and III only 73.Explanation / Answer
69. C) PI-3 kinase and PTEN phosphatase.
Kinases are enzymes that would be attaching the phosphate groups to a particular protein. Phosphatases are enzymes that facilitate removal of phosphate group from the protein.
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