16. What decides and allows amino acid residues are phosphorylated or dephosphorylated? 17. åre process of phosphorylation/dephosphorylation hormone dependent and why ?
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- A newly discovered hormone contains four amino acids linked together. Under which chemical class would this hormone be classified? lipid-derived hormone amino acid-derived hormone peptide hormone glycoproteinWhat is the effect of an inhibitor binding an enzyme? The enzyme is degraded. The enzyme is activated. The enzyme is inactivated. The complex is transported out of the cellWhy are steroids able to diffuse across the plasma membrane? Their transport protein moves them through the membrane They are amphipathic, allowing them to interact with the entire phospholipid Cells express channels that let hormones flow down their concentration gradient into the cells They are non-polar molecules.
- 1. What is the role of ATP in cell signaling in biochemistry?A mutation that changes an alanine residue in the interior of a protein to valine is found to lead to a loss of activity. However, activity is regained when a second mutation at a different position changes an isoleucine residue to glycine. How might this second mutation lead to a restoration of activity?3. How does dimerization of a receptor tyrosine kinase promotes autophosphorylation of the intracellular domain of the receptor? How does the formation of a dimer helps the phosphorylation reaction?4. Describe where is the phosphate group added on a protein when it gets phosphorylated (what amino acid? what atom?). Then list all the ways that protein function may change after it gets phosphorylated PLEASE ANSWER BOTH
- What is the function of a phosphatase? A phosphatase removes phosphorylated amino acids from proteins. A phosphatase removes the phosphate group from phosphorylated amino acid residues in a protein. A phosphatase phosphorylates serine, threonine, and tyrosine residues. A phosphatase degrades second messengers in the cell.What property enables the residues of the amino acids serine, threonine, and tyrosine to be phosphorylated? They are polar. They are non-polar. They contain a hydroxyl group. They occur more frequently in the amino acid sequence of signaling proteins.Which type of molecule acts as a signaling molecule in yeasts? steroid autoinducer mating factor second messenger