8. As presented in class, why produce enzymes in an inactive form (zymogens)? a.
ID: 3519595 • Letter: 8
Question
8. As presented in class, why produce enzymes in an inactive form (zymogens)? a. Ensures enzyme is active only when substrate is present b. Increased chemical stability c. Production in an inactive formi prevents regulation by phosphory d. All of the above e. A and B 9. Potential effect of phosphorylation/dephosphorylation a. Turn down b. Turn off c. Turn on d. Turn up e. All of the above 10. NOT true of enzyme isoforms ino a. Identical function b. Identical primary structure c. Not altered by the reactions they catalyze t d. Tissue specific forms released in some diseased or damaged tissues e. Used for clinical diagnosis 11. Form of energy associated with the Atkins diet a. Glucose b. Glycogen c. Nucleic acids d. Proteins e. Triglycerides Functional significance of glucose storage as glycogen 12. Provides an alternative energy source in all cells of the body a. b. Reduces osmotic pressure .b , UC?S 3d}.to 11A c. Referred to as glycogenolysis d. Serves as a substrate for the Cori cycle e. Traps glucose in the cell Why is the lactic acid pathway particularly relevant to skeletal muscle cells Anaerobic respiration provides more energy than does aerobic respiration a. b. 13. Lactic acid changes the pH of skeletal muscle improving enzyme activity Lactic acid can be used to generate additional energy in the liver c. d. Skeletal muscle cells lack the organelles required for acrobic respiration Skeletal muscle cells often deplete their oxygen stores e. 14. Conversion of lactic acid to glucose occurs in what tissue? a. brain b. heart muscle c. liver d. skeletal muscle e. stomach 15. Characteristicfs) common to both facilitated diffusion and enzymes (as discussed in class) a. Competition b. Complexity c. Phosphorylation d. All of the above e. A and BExplanation / Answer
Q.8
Answer: Option A
Explanation: Zymogens are inactive forms of enzyme. They are converted to active form by another enzyme when required (when substrate is present).
Q.9
Answer: Option E
Explanation: Phosphorylation is mediated by kinase enzyme and Dephosphorylation is mediated by Phosphatase enzyme. These two enzyme can turn off/on, turn up/down any enzyme.
Q.10
Answer: Option B
Explanation: Enzyme isoforms has similar protein function but not identical amino acid sequence. Therefore the primary structure of enzyme isoforms is not identical, whereas the functionality remains the same.
Q.11
Answer: Option D
Explanation: Atkins diet is associated with low carbohydrate diet. Atkins diet are rich in protein and fat. Example: egg, chicken, etc.
Q.12
Answer: Option B.
Explanation: Glucose is soluble in water, hence increased concentration of glucose in the blood will affect the osmotic pressure. Glycogen is insoluble in water, since it is insoluble in water the excessive glucose is converted into glycogen to reduce the osmotic pressure.
Q.13
Answer: Option E.
Explanation: Lactic acid pathway in the skeletal muscle takes place in the absence of oxygen. During excessive exercise the muscle cell is depleted of oxygen as a result of which aerobic respiration is not possible.
Q.14
Answer: Option D
Explanation: Lactic acid pathway in the skeletal muscle takes place in the absence of oxygen. During excessive exercise the muscle cell is depleted of oxygen as a result of which aerobic respiration is not possible.
Q.15
Answer: Option A
Explanation: Facilitated diffusion is the passive transport of molecule along the concentration gradient, so molecules compete to get transported. Same way Enzyme substrate compete for catalysed reaction.
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