BIOL 1201 Chapter : Enzymes Metabolism
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Enzyme Activity
1. Briefly explain the principle of spectrophotometry.
2. Which of the following statements is true about enzymes?(check all correct answers)
__ enzymes act on (are specific for) one or just a fewsubstrates | ||
__ enzymes can be denatured (loose their tertiary/quaternarystructure and activity) by extreme conditions such as heat, high orlow pH,or presence of organic solvents | ||
__most enzymes are DNA | ||
__ enzymes are protein | ||
__enzymes perform best at specific conditions of temperature, pHand salt concentration 5. Which enzymes break the following macromolecules? Match the following with their correponding answers: ___ Nucleic acids A. proteases or proteinases such as pepsin ___ Cellulose B. none ___ Triglycerides C. lipases ___ Proteins D. amylases ___ Starch E. nucleases 6.Match the following enzymes totheir products. Answers ___ pepsin, trypsin and other digestive proteases A.Nucleotides ___ salivary and pancreatic amylases and other enzymes B. AminoAcids ___ lipases C. Monosaccharides ___ nucleases D. fatty acids and glycerol 7. Based on experiments, what is the effect of extremeconditions of pH and temperature (boiling tube) on enzymeactivity? 8. ATP stores energy in the form of___ ___ Chemical energy ___ Kinetic energy ___ Thermal energy ___ Activation energy 9. An allosteric site in anenzyme is____ __ the site where reactions occur __ the site that binds aregulator __ the site that binds thesubstrate __ the site that binds the product 10. Enzymes increase the rate of reactions by making thetransition state less stable. __ False 11. Enzymes increase the rate of reactions by placing reactingparts of the molecule in favorable positions. 12. Which of the followingis a mechanism for regulation of enzymes? 13. Which of the following represents a correct order of eventsin an enzyme catalytic cycle? 1.enzyme changes shape 2.substrate binds to active site 3.substrate is converted to products 4. products are released from activesite __ 1>2>3>4 __ 2>1>3>4 __ 3>2>1>4 __ 2>4>3>1 |
Please help! Not sure about these questions..thanks
QUESTION 1
An example of an endergonic reaction is
A. | Polymerizing a protein from amino acids. | |
B. | Breaking a protein down into amino acids. | |
C. | Breaking down ATP into ADP and P. | |
D. | Breaking down glucose (using oxygen) to make CO2 and H2O. |
QUESTION 2
When ATP breaks down to supply energy for cellular reactions, it often transfers its 3rd phosphate to another molecule. This is called ______, and makes the other molecule _______ reactive.
A. | catalysis . . . more | |
B. | phosphorylation . . . more | |
C. | phosphorylation . . . less | |
D. | polymerization . . . less |
QUESTION 3
Which is true of enzymes?
A. | They are highly specific in the reactions they catalyze. | |
B. | Chemically, most are carbohydrates. | |
C. | They accelerate reactions by adding energy. | |
D. | They break down and are used up as they catalyze reactions. |
QUESTION 4
What is peristalsis?
A. | Rings of muscle that can contract to close off the stomach at each end. | |
B. | A gland that secretes saliva. | |
C. | Coordinated muscle contractions that move the contents of the GI tract. | |
D. | A stomach enzyme that breaks down proteins. |
QUESTION 5
Which is not a component of gastric juice?
A. | H2O | |
B. | acid | |
C. | pepsin | |
D. | amylase | |
QUESTION 6
What does the enzyme pepsin do?
A. | Completely breaks down proteins into individual amino acids. | |
B. | Completely breaks down carbohydrates into monosaccharides. | |
C. | Partially breaks down proteins into smaller polypeptides. | |
D. | Partially breaks down fats into fatty acids. |