a molecule that regulates an enzyme by binding to its regulatory site is called: A. Coenzyme...
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a molecule that regulates an enzyme by binding to its
regulatory site is called:
A. Coenzyme...
How does the binding of a regulatory molecule to the allosteric site affect the activity of...
How does the binding of a regulatory molecule to the allosteric site affect the activity of an enzyme? Group of answer choices A. It may decrease the activity of the enzyme. B. It may change the shape of the substrate. C. It may change the affinity of the enzyme for its substrate. All of the above A and C
12. Which of the following statements is true of enzyme catalysts? A B C To be...
12. Which of the following statements is true of enzyme catalysts? A B C To be effective, they must be present at the same concentration as their substrate. They can increase the equilibrium constant for a given reaction by a thousand-fold or more. They lower the activation energy for conversion of substrate to product. Their catalytic activity is independent of pH. They are generally equally active on D and L isomers of a given substrate. D E 13. In competitive...
Please answer all.... Thank you! 57) An enzyme binding site with a specific shape can bind...
Please answer all.... Thank you!
57) An enzyme binding site with a specific shape can bind only those having a complementary shape; thus, the shape of the protein molecule determines the specificity of the binding site the affinity of the binding site the saturation of the binding site the counding strength of the binding site Two of the above are correct. 58) A cell is what it is because of the instructions it receives concerning the types of proteins (enzymes...
Question 1 (1 point) The sunshine operon regulates a series of genes that help one respond...
Question 1 (1 point) The sunshine operon regulates a series of genes that help one respond favorably to warm weather and sunlight. The regulator of this operon is usually bound to DNA, but becomes inactive (i.e., it falls off the DNA) when a small molecule binds to it that inactivates its DNA binding properties. What is the term for the type of regulatory control of this operon? Repressible Inducible Constitutive Catabolic Photophobic Question 2 (1 point)
Question 28: A system in which a regulatory protein binding to a co-regulatory molecule causes it...
Question 28: A system in which a regulatory protein binding to a co-regulatory molecule causes it to leave the operator, thereby inhibiting transcription of target genes, an example of: Group of answer choices a. Inducible negative control b. Repressible positive control c. Inducible positive control d. Repressible negative control Question 29: MEK, a MAP kinase kinase, is activated by phosphorylation. You create a mutant MEK in which the amino acids that are normally phosphorylated is replaced with aspartate. Predict the...
The active site of an enzyme ____. A. is remote form the site of substrate attachment...
The active site of an enzyme ____. A. is remote form the site of substrate attachment B. is converted to a product C. is the region where the reaction takes place D. increases the energy of reaction E. includes the entire enzyme In the lock-and-key model of enzyme actin, the enzyme active site is thought of as ___. A. a rigid, nonflexible shape that fits the substrate exactly B. an area of the enzyme that can adjust to fit the...
3. Answer Shown below is a binding isotherm for an enzyme called a phosphatase and a...
3. Answer Shown below is a binding isotherm for an enzyme called a phosphatase and a lead compound known as JF99. There is a tryptophan near the binding site, and the fluorescence from this residue increases upon binding the compound (shown on the y axis). At the highest concentration of JF99 tested (1 uM), the fluorescence signal is 490 units (not shown on the graph). Estimate the value of KD- fluorescence signal (arbitrary units) ° 10 20 30 40 [JF99]...
Enzyme 6. Where do substrates bind on an enzyme? A. allosteric site B. active site C....
Enzyme 6. Where do substrates bind on an enzyme? A. allosteric site B. active site C. receptor D. ion channel 7. Enzymes are capable of increasing the rate of a chemical reaction through which of the following means? A. changing AG from positive to negative B. reducing the activation energy C. changing the equilibrium point of the reaction D. increasing kinetic energy 8. When a molecule can occupy the same active site as the substrate, a situation called can result...
25. What is a riboswitch? A. a small molecule that regulates the translation of specific mRNAs...
25. What is a riboswitch? A. a small molecule that regulates the translation of specific mRNAs B. a gene regulatory protein that turns on the expression of ribosomal proteins C. an mRNA that can regulate its own transcription and translation D. a ribosome that participates in attenuation E. when the antisense RNA binds to the transcript 26. In the Ames Test, the appearance of his+ revertants in the presence of a non-mutagenic control compound indicates that _______. A. liver extract...
15. Diffusion of water through a differentially permeable membrane is called A. active transport. B. energy....
15. Diffusion of water through a differentially permeable membrane is called A. active transport. B. energy. C. osmosis. D. All of these answers are true. 16. What happens when an animal cell is placed into a hypertonic solution? A. plasmolysis B. crenation occurs C. it swells D. it is unchanged 17. The point on the enzyme where the enzyme causes the substrate to change is called the A. attachment site. B. active site. C. binding site. D. enzyme-substrate complex 18....
12. Which of the following statements is true of enzyme catalysts? A B C To be effective, they must be present at the same concentration as their substrate. They can increase the equilibrium constant for a given reaction by a thousand-fold or more. They lower the activation energy for conversion of substrate to product. Their catalytic activity is independent of pH. They are generally equally active on D and L isomers of a given substrate. D E 13. In competitive...
Please answer all.... Thank you!
57) An enzyme binding site with a specific shape can bind only those having a complementary shape; thus, the shape of the protein molecule determines the specificity of the binding site the affinity of the binding site the saturation of the binding site the counding strength of the binding site Two of the above are correct. 58) A cell is what it is because of the instructions it receives concerning the types of proteins (enzymes...
Question 1 (1 point) The sunshine operon regulates a series of genes that help one respond favorably to warm weather and sunlight. The regulator of this operon is usually bound to DNA, but becomes inactive (i.e., it falls off the DNA) when a small molecule binds to it that inactivates its DNA binding properties. What is the term for the type of regulatory control of this operon? Repressible Inducible Constitutive Catabolic Photophobic Question 2 (1 point)
The active site of an enzyme ____. A. is remote form the site of substrate attachment B. is converted to a product C. is the region where the reaction takes place D. increases the energy of reaction E. includes the entire enzyme In the lock-and-key model of enzyme actin, the enzyme active site is thought of as ___. A. a rigid, nonflexible shape that fits the substrate exactly B. an area of the enzyme that can adjust to fit the...
3. Answer Shown below is a binding isotherm for an enzyme called a phosphatase and a lead compound known as JF99. There is a tryptophan near the binding site, and the fluorescence from this residue increases upon binding the compound (shown on the y axis). At the highest concentration of JF99 tested (1 uM), the fluorescence signal is 490 units (not shown on the graph). Estimate the value of KD- fluorescence signal (arbitrary units) ° 10 20 30 40 [JF99]...
Enzyme 6. Where do substrates bind on an enzyme? A. allosteric site B. active site C. receptor D. ion channel 7. Enzymes are capable of increasing the rate of a chemical reaction through which of the following means? A. changing AG from positive to negative B. reducing the activation energy C. changing the equilibrium point of the reaction D. increasing kinetic energy 8. When a molecule can occupy the same active site as the substrate, a situation called can result...
15. Diffusion of water through a differentially permeable membrane is called A. active transport. B. energy. C. osmosis. D. All of these answers are true. 16. What happens when an animal cell is placed into a hypertonic solution? A. plasmolysis B. crenation occurs C. it swells D. it is unchanged 17. The point on the enzyme where the enzyme causes the substrate to change is called the A. attachment site. B. active site. C. binding site. D. enzyme-substrate complex 18....
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