FSC Biology Book MCQs Chapter 3 Class 11





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Biology Ch 3 Class 11 ENZYMES

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Most enzymes have an optimum temperature of around:

PMC 2020
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Upon increasing the temperature the shape of enzyme’s active site?

PMC Sample 2
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Optimum temperature for enzymes of human body is:

NUMS 2018
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Which step causes activation of catalytic site of an enzyme?

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The active site of an enzyme:

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The optimum pH of catalase is:

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When inhibitor binds to enzyme other than active site and alters its structure, then it is called:

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Which one forms the raw material for coenzymes?

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The enzyme found in saliva responsible for the digestion of carbohydrates is:

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In enzymatic mechanism, the substrate bind to the enzyme active site to produce?

PMC Practice 3
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The enzyme in breast milk that causes the coagulation of milk or forms precipitates of milk is:

NUMS 2016
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The Induced fit model was introduced by Koshland in which of the following year?

PMC Sample 1
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The pH at which the activity of pancreatic lipase enzyme is maximum is:

NUMS 2019 Cancelled
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In 1959, Koshland proposed which of the following?

PMC Practice 1
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A cofactor made of inorganic ion which is detachable is called

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If another molecule, having a shape very similar to the enzymes substrate, binds to its active site, it would then ____ the enzyme’s function:

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Lock and Key model was proposed by

 

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An activated enzyme consisting of polypeptide chain and a cofactor is called:

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If we add more substrate to an already occurring enzymatic reaction and it has no affect on the rate of reaction, the process is called?

PMC Practice 2
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The structure of an enzyme is altered by:

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Malonic acid is an example of:

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Reversible inhibitors form WEAK linkages with which of the following?

PMC Sample 3
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23 / 74

Which statement is incorrect about Lock and Key Model?

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In which of the following location enzymes controlling cellular respiration are present?

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

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Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called

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Inactive enzyme precursors such as pepsinogen for pepsin are called as:

PMC Practice 1
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Which of the following factors affect enzyme activity?

NTS 2011
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A/An _______ is mostly a non-protein chemical compound that is required for the protein’s biological activity.

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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:

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Due to the similarity of structure, competitive inhibitors may be selected by the _______ site.

NUMS 2019 Reconduct
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Cyanide for enzymes act as:

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The lock and key model of enzyme action was proposed by:

PMC Sample 3
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Some enzymes require the presence of a non protein molecule to behave catalytically. An enzyme devoid of this molecule is called a(n):

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Non-protein but inorganic, detachable co-factors are called ______:

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

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The following statements are about enzymes:

1. They are globular proteins

2. They can be inhibited by competitive inhibitors

3. They are formed in the smooth endoplasmic reticulum

4. There are only found attached to Plasma membranes in the cell

Which statements are correct for all enzymes?

NTS 2015 DUHS and JSMU
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Enzymes work by which of the following?

PMC Practice 1
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Enzymes work by lowering the ______ of the reactions they catalyse:

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If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of

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During feedback inhibition, which of the following structural part of enzyme is involved?

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If the non-protien part is loosely attached to the protein part in the enzyme, it is known as ______.

PMC Practice 3
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A reaction will proceed faster if the activation energy is?

PMC Sample 1
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The type of energy, reduced by the enzymes, for biological reactions to occur is called the:

UHS 2019
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A student of chemical engineering mistakenly engulfed the toxic compound “A” which was a potent inhibitor of a certain enzyme. He was immediately brought to a hospital where the doctor injected, intravenously, substrate “B” to minimize the toxic effect of Compound A. His life was saved from serious damage. The treatment method shows that compound A was a ______ inhibitor.

UHS 2019
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Optimal temperature of enzymes present in human body is

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Antibodies can be digested by using which of the following types of enzymes?

PMC Sample 3
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Which of the following statements is incorrect?

PMC Sample 1
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Which of the following statements about enzymes is false?

PMC Sample 1
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50 / 74

If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because:

51 / 74

Excessive increase in temperature of medium causes the enzyme molecule to

 

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The substrate binds to specific region of enzyme called?

PMC Sample 1
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An example of competitive inhibition of an enzyme is the inhibition of;

UHS 2019
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The optimum pH for the enzyme arginase is which of the following?

PMC Sample 2
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55 / 74

Which of the following statements is incorrect?

PMC Practice 1
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The cofactor usually acts as “bridge” between:

NUMS 2018
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Identify the wrong statements.

(a) The substrate binds to active site of enzyme and not fitting into active site

(b) The binding of substrate induces the enzyme to alter its shape

(c) Chemical bonds of substrate break down not to form new enzyme-product complex

(d) The enzyme releases the products of the reaction and runs through catalytic cycle once again

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Restriction endonucleases

PMC Sample 2
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59 / 74

What is not true about the induced fit model:

NUMS 2018
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B

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A substance which binds at the active site of the enzyme but does not result in the formation of the products is called:

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Enzymes binds with chemical reactant which is known as?

PMC Sample 3
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62 / 74

Which type of bonds are never formed when a substrate fits into the active site of an enzyme?

PMC Practice 1
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The inhibitor which closely resembles the substrate in its molecular structure and inhibits the enzyme activity by binding to the active site of the enzyme is called:

NTS 2013
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If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction.

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Extreme change in pH results in:

 

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Enzymes _________ the activation energy of a chemical reaction

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The number of substrate molecules converted into the product by one molecule of enzyme active site per unit time is called?

PMC Practice 2
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An enzyme increases the speed of a reaction:

NTS 2012
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The effect of competitive inhibitor on enzyme activity is such that it affects which of the following?

PMC Sample 2
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A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called

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Which statement about enzyme is incorrect:

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Lock and Key Model for enzyme action propose by Emil Fischer suggests that:

PMC 2020
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Inhibitors which block the enzyme by forming weak bond are called

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An activated enzyme made of polypeptide chain and a cofactor is?

PMC Practice 2
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5 responses to “FSC Biology Book MCQs Chapter 3 Class 11”

  1. thank you sir this is very informative quiz i like your work for the aspirants of Mdcat . May you live long.

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