Enzyme Activity & Tertiary Structure — NEET Biology
📚 Practice ConceptThe activity of an enzyme can be affected by a change in the conditions which can alter the tertiary structure of the protein. These include temperature, pH, change in substrate concentration or binding of specific chemicals that regulate its activity.
Which of the above statements are correct? S1: Enzymes generally function optimally within a narrow range of temperature and pH, with activity declining sharply outside this range. S2: At temperatures significantly above the optimum, enzymes undergo denaturation, which permanently destroys their catalytic activity. S3: Low temperatures temporarily inactivate enzymes, preserving their structure and allowing them to regain activity upon temperature increase. S4: The maximum velocity (Vmax) of an enzyme-catalyzed reaction can be continuously increased by further raising the substrate concentration. S5: Competitive inhibitors structurally resemble the natural substrate and bind to the enzyme's active site, thereby blocking substrate access. S6: Enzymes isolated from organisms adapted to extremely high temperatures typically lose their catalytic power above 40°C.
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