CHEM131/ENZYMES 1) Enzymes are members of which class of C) N-terminal D) C-term
ID: 1085682 • Letter: C
Question
CHEM131/ENZYMES 1) Enzymes are members of which class of C) N-terminal D) C-terminal E) Precursor biomolecules? A) Carbohydrates B) Lipids C) Nucleic acids 7) Enzymes function as catalysts by A) Changing the value of the free energy change to a more favorable value. B) Changing the value of the equilibrium constant to a more favorable value. C) Lowering the value of the activation energy. D) Increasing the amount of time needed to reach equilibrium. E) Becoming one of the reactants D) Proteins E) Steroids 2) What is the function of enzymes? A) Structure and support B) Energy reserves C) Biochemical catalysts D) Communication between cells E) Physical protection 8) Enzymes increase the rates of only certain reactions involving certain substances. This general characteristic is called A) Selectivity B) Specificity C) Enzyme regulation. D) Catalytic efficiency E) Enzyme inhibiti 3) The reactant in an enzyme-catalyzed reaction is called the A) hormone. B) Substrate. C) Cofactor D) Inhibitor E) Vitamin. 4) Each of the following phrases correctly describes enzymes except A) Dissolve in water. B) Have a globular shape. C) Behave as substrates. D) Contain an active site. E) Act as catalysts. 9) Overdosing on vitamins A and D is more likely than overdosing on vitamin C because A) Vitamins A and D are fat soluble and thus can accumulate in body fat, where vitamin C is water soluble and the excess will be excreted in urine. B) Vitamin C is fat soluble and thus can accumulate in body fat, where vitamins A and D are water soluble and the excess will be excreted in urine. 5) The tertiary structure of most enzymes is A) An -helix. B) a -pleated sheet. C) Fibrous. D) Globular E) None of these. C) Vitamin C is biologically active as consumed in foods, but vitamins A and D must be converted into biologically active forms before utilization 6) Which term identifies the relatively small portion of the enzyme that is directly involved in the biochemical reaction being catalyzed? A) Substrate B) Active site D) Vitamins A and D are biologically active as consumed in foods, but vitamin C must be converted into biologically active forms before utilization. E) Vitamins A and D are needed in much larger doses than vitamin C. De Feb lothExplanation / Answer
Ans 1 : D) Proteins
Enzymes are called as the biological catalysts as they increase the rate of biochemical reactions , without getting themselves used up in the reaction. Most of the enzymes are proteinaceous in nature , the reason they are become denatured at odd temperatures and pH conditions.