e maternal erythrocyte. 12. Which of the following a. The substrate binds more r
ID: 1033425 • Letter: E
Question
e maternal erythrocyte. 12. Which of the following a. The substrate binds more rightly to the T form b. The substrate does not bind to the T form atements is true for allosteric enzymes? d. The binding of the substrate favors the transition of the of the substrate favors the transition of the T form to the R form R form to the T form 13. Allosteric enzymes generally exhibit a. Linear kinetics b. Hyperbolic kinetics c. Classical Michaelis-Menten kinetics d. Sigmoidal kinetics 14. The rate of an enzyme catalyzed reaction a. I b. Is maximized over a narrow range of pH values c. Increases as pH increases d. Decreases as pH increases s independent of pH over abroad range of pH values 15. Which of the following enzymes is likely not to be regulated? a. The first enzyme in a pathway b. The enzyme catalyzing a direction in a futile cycle c. The first enzyme following a branch point in metabolism d. The last enzyme in a multi-enzyme pathway 16. Which best describes a pathway? a. Several genes under the same control mechanism b. A sequence of chemical events used to describe an enzyme mechanism c. A sequence of steps taken by a compound to pass through a membrane d. A sequence of metabolites and the enzymes that interconvert these metabolitesExplanation / Answer
12) The answer is c.T state is tense state and R state is relaxed state.Affinity of T state is low in comparision to R state.Due to lower affinity it has lower catatlytic efficiency so R state is favoured more.
13) Answer is sigmoidal kinetics.Allosteric enzyme don't obey michaelis-menten kinetics.Allosteric enzyme show relationship between V0 and [S] that differ from michaelis-menten kinetics.They do exhibit saturation with substrate when (S) is suficiently high, produce a sigmoid curve rather than the hyperbolic curve typical of non-regulatory enzymes.
14) answer is maximised over a narrow range of pH.Enzymes are sensitive to pH.Most enzymes are active within only a narrow pH range typically 5 to 9.This pH dependence is due to the presence of charged amino acid at the active site.Variation in pH causes changes in overall charge of amino acids.Since catalytic activity relies on a specific state of ionisation of amino acid residues, enzymes activity changes as a result of change in pH.Each enzyme has its optimal pH at which maximum activity occurs.
16) the answer is d.
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