The figure given below shows three velocity substrate concentration curves for an enzyme reaction. What do the curves a, b, and c depict respectively?
(a) a - normal enzyme reaction
b - competitive inhibition
c - non-competitive inhibition
(b) a - enzyme with an allosteric modulator added
b - normal enzyme activity
c - competitive inhibition
(c) a - enzyme with an allosteric stimulator
b - competitive inhibition added
c - normal enzyme reaction
(d) a - normal enzyme reaction
b - non-competitive inhibitor added
c - allosteric inhibitor added
(a) Enzymes or biocatalyst are proteinaceous substance that are capable of biological systems without themselves undergoing any change. In the graph a shows normal enzyme reaction, graph b shows competitive inhibition and graph c shows non competitive inhibition. In competitive inhibition the inhibitor, which is a substrate analogue, combines reversibly to the free enzyme at the active site. In non-competitive inhibition, the inhibitor binds to enzyme at a place other than substrate binding site. It results in destruction of enzyme activity.