REA MCAT Multiple Choice Q's with correct A's

REA MCAT Multiple Choice Q'sEnzymes are: a. proteins b. catalysts c. carbohydrates d. both proteins and catalysts - correct answer D. Enzymes are proteins that act as catalysts. Carbohydrates are not proteins, and therefore cannot be enzymes. Organisms can control all of the following EXCEPT: a. location of enzymes b. type of enzymes c. amount of enzymes d. activity of enzymes - correct answer B. Organisms control the activity of enzymes by changing or blocking active sites. Location and amount of enzymes may be controlled through feedback. Types of enzymes are determined genetically and cannot be altered. In feedback inhibition of metabolic pathways, which are controlled directly? a. end pdts b. metabolites c. enzymes d. precursor molecules - correct answer C. In feedback inhibition the flow of metabolites is often regulated by controlling the activity of key enzymes in a pathway. Usually, the first enzyme in a metabolic pathway is controlled by the end product of the pathway. Glycolysis does NOT: a. occur in the cytoplasm b. require oxygen c. produce ATP