Enzymes - Mock Test 7

Question 61

Extreme change in pH results in?

A) Change in ionization of amino acids at the active site of the enzyme. B) Change in the ionization of the substrate. C) Denaturation of the enzyme D) Increase in the reaction rate

---

No Details

Question 62

Excessive increase in temperature of medium causes the enzyme molecule to?

A) Activate B) Unaffected C) Denatured D) None of these

---

No Details

Question 63

The active site of an enzyme?

A) Never changes B) Forms no chemical bond with substrate C) Determined by structure and the specificity of the enzyme. D) They are non specific in their action

---

No Details

Question 64

If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation?

A) Saturation B) Denaturation C) Composition D) Inhibition

---

No Details

Question 65

The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect?

A) Increase in enzyme molecule increases the available active sites. B) This relation is for unlimited time period with unlimited enzyme concentration C) If the concentration is doubled the rate will become two fol D) None of these

---

No Details

Question 66

Lock and Key model was proposed by?

A) Emil Fischer B) Koshland C) Robin Williams D) Rudolph Virchow

---

No Details

Question 67

Which step causes activation of catalytic site of an enzyme?

A) Change in pH of the surroundings. B) Formation of Enzyme Susstrate complex. C) Change in the charge of the active site. D) Change in temperature

---

No Details

Question 68

A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called?

A) Active site B) Binding site C) Catalytic site D) Allosteric site

---

No Details

Question 69

Enzymes _________ the activation energy of a chemical reaction?

A) Increases B) Decreases C) Does not effect D) Increases or decreases depending upon individual enzyme

---

No Details

Question 70

A cofactor made of inorganic ion which is detachable is called?

A) Prosthetic group B) Coenzyme C) Activator D) Cofactor

---

No Details