1. Protein A is allosterically regulated by molecule X. You mix samples of Protein A with increasing concentrations of molecule X. Which graph best represents Protein A activity? A.Graph A B.Graph B C.Graph C D.A different shape not shown here

2. Protein A is negatively regulated by allosteric binding of molecule X. You mix samples of Protein A with increasing concentrations of molecule X. Draw what the graph of Protein A activity would look like, holding the concentration of Protein A constant.

3. A protein is made of 100 amino acids. The following is true: A. the protein has 98 peptide bonds B. the protein has 98 R groups C. the protein has 98 domains D. none of the above You are analyzing two versions of an enzyme that breaks down proteins, one from crickets and one from horse liver. You put in equal concentrations of each enzyme in two test tubes (at room temperature) with the same protein substrate, and find that the horse enzyme breaks down the protein more slowly than the cricket enzyme. What could be the reason(s) for this? A. the horse enzyme has a different amino acid sequence than the cricket enzyme B. the horse enzyme works better at a higher temperature than the cricket enzyme C. the cricket enzyme has a different tertiary structure from the horse enzyme D. all of the above are possible If you replace a basic amino acid in a protein with an acidic one, the following might happen to the protein: A. nothing B. the protein might fold differently C. the protein might behave differently D. all of the above