Welcome to your CIE AS Enzymes The fitting of substrate in active site is called as: Condensation Hydrolysis Polymerization Lock and key hypothesisA molecule which speeds up a chemical reaction but remains unchanged at the end of the reaction. Substrate Product Catalyst InhibitorIn lock and key hypothesis, substrate is the: Key Both lock and key Magenta molecule LockWhat are the factors that affect enzyme action? a) Enzyme concentration b) Substrate concentration c) pH d) Temperature b, c & d a, b & c c & d only AllWhat is meant by 'denaturation' of enzymes? The enzyme losing its shape only The enzyme losing its shape and activity The enzyme losing its activity only The enzyme beginning to look for other substratesThe rate of an enzyme-controlled reaction is always _______ at the begining. Slowest Neutral Fastest FluctuatingWhat is the optimum temperature of most human enzymes? Around 40°C Around 26°C Around 45°C Around 30°CSelect the incorrect statement regarding enzymes. Enzymes are biological catalysts. Denaturation of enzymes is a reversible process. Not all enzymes operate within cells. Some enzymes, such as those found in bacteria living in hot water springs have much higher optimum temperatures.What is the modern hypothesis for enzyme action? Lock and key hypothesis Enzyme substrate hypothesis Induced fit hypothesis Lock and substrate hypothesisThe purpose of hydrophillic R group in enzymes is: To add to the stability of the enzyme. To help protein molecules coil in 3 dimentional space. To prevent the enzymes from being denatured at higher temperatures. To ensure that they are soluble.