WGU Biochemistry OA Questions And Answers.pdf

Which metal ion is bound to the porphyrin ring in hemoglobin? Ans - Iron Which feature of hemoglobin makes it an effective O2 transport molecule? Ans - It's affinity for O2 is regulated by pH. What is a temporary modification to protein structure by kinases that alters enzyme function? Ans - Phosphorylation Which type of inhibition occurs when a particular drug binds to the allosteric site of an enzyme and subsequently changes the enzyme's structure? Ans - Noncompetitive Proteases Ans - -a class of enzymes -hydrolyze protein strands into smaller units -increase pH= significant decrease in protease activity How do the rates of enzyme catalyzed reactions compare to those of corresponding uncatalyzed reactions? Ans - They are 10^6 to 10^12 times faster. Which change will likely increase the activity of an enzyme currently at optimal conditions? Ans - Significantly increasing substrate concentrations What occurs immediately after the appropriate molecule enters the active site of the enzyme? Ans - The enzyme binds to the molecule to form an enzyme molecule complex. Are enzymes specific? Ans - Yes