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- In a Lineweaver-Burk graph, the lines representing the uninhibited and inhibited enzyme catalyzed reaction meet each other on the x-axis. The type of inhibition which is occurring is: a) competitive b) noncompetitive c) uncompetitive d) allosteric CO2 exerts direct activity upon hemoglobin by: a) blocking oxygen from binding to the heme group b) displacing BPG from the central cavity c) oxidizing Fe+2 to Fe+3 which does not bind oxygen d) forming an N-terminal carbamate which favors the T-state The dominant motif found in hemoglobin and myoglobin is: a) helix-turn-helix b) twisted beta sheet c) beta barrel d) random coil Which of these is an ketohexose? a) fructose b) glucose c) ribose d) erythrose Which of these is a constitutional isomer of d-glucose? a) fructose b) galactose c) l-glucose d) ribose Which of these is an enantiomer of d-glucose? a) d-fructose b) d- galactose c) l-glucose d) d-ribose Which of these is a diastereomer of…Chemiosmosis involves a. the movement of electrons across the cell membrane. b. the movement of hydrogen atoms across a mitochondrial membrane. c. the movement of hydrogen ions across a mitochondrial membrane. d. the movement of glucose through the cell membrane.Which enzymatic reactions enumerated below does ActRIIB catalyze (select all that apply)? A. Add sugars to Asn B. Phosphorylate Threonine C. Phosphorylate Serine D. Phosphorylate Tyrosine E. Cleave proteins after glutamine
- Which of these enzymes are examples of transferases? a.dehydrogenases b. kinases c. Decarboxylases d. stearasasDefine the following terms: a. HETPP b. nucleoside diphosphate kinase c. amphibolic pathway d. anaplerotic reaction e. citric acid cycleIn what way(s) are Trypsin, Chymotrypsin, and Elastase different? (choose 1) a) They target different amino acid residues in proteins. b) They use different reaction mechanisms c) Both of the above d) Neither of the above
- In order to inactivate enzymes involved in cancer, chemists at pharmaceutical companies search for _______ that would ____ the enzyme’s active site. Select one: a. elements, bind to b. molecules, bind to c. elements, repel d. molecules, repelThe enzyme phosphoglycerate mutase promotes which of the following? a. the hydrolysis of 3-phosphoglycerate b. the isomerization of 3-phosphoglycerate c. the oxidation of 3-phosphoglycerate d. the reduction of 3-phosphoglycerateAll of the following increase enzymatic activity except a. an increase in temperature. b. an increase in pH. c. an increase in concentration of the substrate. d. an increase in concentration of the enzyme that catalyzes the reaction.
- which of the following statements are correct?a. coenzyme is an alternate name for all cofactors b. metal ions can function as cofactors c. all conjugated enzymes contain cofactorsCyanide inhibits an enzymatic complex located in the: a. Nucleus b. Inner mitochondiral membrane c. Outer mitochondrial membrane d. CytosolDoes the enzyme described in each of the following statementsrequire a cofactor to be active?(a) Ni2+ is present in the active site.(b) Addition of FAD allows the reaction to occur.(c) The presence of K+ does not affect the reaction.