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Which of the following statements is TRUE when aspartic acid in a protein is positioned in proximity with glutamic acid?
- The pKa of aspartic is increased.
- The proton dissociation from aspartic acid side chain is favored.
- The pKa of aspartic acid is decreased
- The pKa of aspartic acid is unaffected.
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- The pKa of an acid depends partly on its environment. Predict the effect of each of the following environmental changes on the pKa of a glutamic acid side chain. (a) A lysine side chain is brought into proximity. (b) The terminal carboxyl group of the protein is brought into proximity. (c) The glutamic acid side chain is shifted from the outside of the protein to a nonpolar site insideWhich of the following correctly describes the 3 amino acids that are most likely to undergo phosphorylation? a) Serine, threonine, tyrosine b) Cysteine, tryptophan, tyrosine c) Serine, tyrosine, cysteine d) Tyrosine, asparagine, serineWhich of the following amino acids is most likely to be found on the outside of a soluble protein? Which is more likely to be found on the inside? Explain each answer. (Hint: Consider the effect of the amino acid side chain in each case and that the protein is folded up into its globularform.)(a) Leucine (b) Glutamate(c) Phenylalanine (d) Glutamine
- One example of a stage 3 reaction in the heterotrophic breakdown of food molecules is: the intramitochondrial digestion of fatty acids into carbon dioxide and water the intracellular digestion of glucose monomers into pyruvate the intracellular digestion of some amino acids into NH4+ and pyruvate the extracellular digestion of polypeptides into amino acids the extracellular digestion of triglycerides into fatty acids and glycerolA 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?One example of a stage 1 reaction in the heterotrophic breakdown of food molecules is: the intramitochondrial digestion of pyruvate into carbon dioxide and water the intramitochondrial digestion of fatty acids into carbon dioxide and water the extracellular digestion of triglycerides into fatty acids and glycerol the intracellular digestion of some amino acids into NH4+ and pyruvate the intracellular digestion of glucose monomers into pyruvate
- Maltase is an enzyme that catalyzes the hydrolysis of the disaccharide maltose. This process occurs during human digestion when maltase is secreted by the intestine and then converts maltose into glucose. Which two classes of biomolecules are directly involved in this process?An N-linked glycoprotein contains a glycan covalently linked to which specific amino acid in a protein? Asparagine Glutamine Threonine SerineHow many NTP molecules are required to synthesize glucose from each of the following compounds? (a) Glucose 6-phosphate (b) Fructose 1,6-bisphosphate (c) Two molecules of oxaloacetate (d) Two molecules of dihydroxyacetone phosphate
- What is the percent ionization of these amino acids? 1. Aspartame at pH 5.4 2. Glutamate at pH 11.8 3. Histidine at pH 8.0 4. Tyrosine at pH 8.0If sucrase breaks down sucrose and a mystery sugar inhibits sucrase from breaking down sucrose allowing sucrose to mobilize in the body, what kind of inhibition is the mystery sugar? i.e. uncompetitive, competitive, non-competitiveWhich of the following can be used to synthesize glucose by gluconeogenesis in the liver?a. fatty acidb. triglyceridec. glycerold. glycogene. ATP
