In general, higher temperatures equal faster reaction rates. Which chemical is classified as an enzyme? Q:51: At about 0 C, most enzymes are (A) Inactive (B) Active (C) Destroyed (D) Replicated Q: 52: Vitamins are essential to the survival of organisms because vitamins usually function as (A) Substrates (B) Nucleic acids (C) Co-enzymes (D) Nucleosides '6 A. amylase 1. synthesizes DNA ~B. The optimum pH for this reaction is 6.7. Enzymes (/ ˈ ɛ n z aɪ m z /) are proteins that act as biological catalysts (biocatalysts). We sterilize objects by placing them in boiling water, which denatures the enzymes of any bacteria that may be in or on them. We preserve our food by refrigerating or freezing it, which slows enzyme activity. This fact has several practical applications. We sterilize objects by placing them in boiling water, which denatures the enzymes of any bacteria that may be in or on them. This fact has several practical applications. Hydrolases – These enzymes catalyse the hydrolytic cleavage of C-O, C-N, C-C and some other bonds, including phosphoric anhydride bonds. 5. At 0°C and 100°C, the rate of enzyme-catalyzed reactions is nearly zero. Page 1 ENZYMES ANSWERS & MARK SCHEMES AS 3 QUESTIONSHEET 1 (a) hydrogen peroxide; 1 (b) (i) to release catalase from within liver cells; 1 (ii) Any 2 of: same weight of liver/same species/animal for liver/same volume of buffer at same pH/keep cool or at 4 0C /homogenise in blender for same time;; 2 Vitamins are essential to the survival of organisms because vitamins usually function as:-) coenzymes. We preserve our food by refrigerating or freezing it, which slows enzyme activity. d) … ), 37° C (human body temp. ), and 100° C (boiling water). Catalysts accelerate chemical reactions.The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products.Almost all metabolic processes in the cell need enzyme catalysis in order to occur at rates fast enough to … At about 0 C., most enzymes are. c) Only catalyze one particular reaction. The term enzyme specificity means that most enzymes: a) Only work at body temperature of 37 deg C. b) Only work at a particular pH value. protease 2. digests sugar in beer (maltose) A) enzymes are sent to specific substrates by ribosomes B) different enzymes are made in specific areas of the cytoplasm C) most enzymes can catalyze many different reactions D) enzymes can only bind to specific substrates 4. Salivary amylase is an enzyme in humans that breaks down starch. The elevated liver enzymes most commonly found are: Elevated liver enzymes often indicate inflammation or damage to cells in the liver. 4. Active sites are where reactions take place on an enzyme and can only act upon one substrate, which can be other proteins or sugars. Match the enzymes with their substrates and functions. inactive. Lyases – Lyases are enzymes cleaving C-C, C-O, C-N, and other bonds by elimination, leaving double bonds or rings, or conversely adding groups to double bonds. At 0°C and 100°C, the rate of enzyme-catalyzed reactions is nearly zero. Name _____ Regents Biology . Enzymes have multiple regions that can be activated by co-factors to turn them on and off. Inflamed or injured liver cells leak higher than normal amounts of certain chemicals, including liver enzymes, into the bloodstream, elevating liver enzymes on blood tests. Temperature affects all chemical reactions, enzyme-catalyzed or not. protease. We ran our reactions at four temperatures: 0° C (freezing), 23°-25° C (room temp. The co-factors are usually vitamins consumed through various food sources and open up the active site on the enzyme.