Enzymes topic based MCQs preparation test for all competitive exam. Enzymes Chapter# 4, topic based MCQs that are mostly asked in competitive exam related to Biology. Examtry team design a series of MCQs based tests that effectively and efficiently help a student or job seeker to prepare their exam effectively and efficiently.
Examtry team design more than 40 MCQs and try their best to cover the whole topic Enzymes . These MCQs based test really helpful in all competitive exams as well as institutional exams. Anyone who wants to pass job test comprising one paper or MCQs based test come on examtry.com and get prepared himself.
MCQs under the topic of Enzymes covers all tests conducted by FPSC, NTS, KPSC, PPSC, SPSC, BPSC, OTS, UTS, UPS, PTS, CTS, ATS, ETEA or any other institution.
1 - Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called
Enzymes
2 - Which statement about enzyme is incorrect:
All enzymes are fibrous Proteins.
3 - In which of the following location enzymes controlling cellular respiration are present?
Milochondria
4 - An activated enzyme consisting of polypeptide chain and a cofactor is called:
Both b and c
5 - Which one forms the raw material for coenzymes?
Vitamins
6 - A cofactor made of inorganic ion which is detachable is called
Activator
7 - Enzymes _________ the activation energy of a chemical reaction
Decreases
8 - A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called
Active site
9 - Which step causes activation of catalytic site of an enzyme?
Formation of Enzyme Susstrate complex.
10 - Lock and Key model was proposed by
Emil Fischer
11 - Which statement is incorrect about Lock and Key Model?
It explains the mechanism of every chemical reaction.
12 - The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect:
This relation is for unlimited time period with unlimited enzyme concentration
13 - 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
All the active sites on enzyme molecule are occupied.
14 - If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because:
There is probably more enzayme available than there is substrate.
15 - 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:
Saturation
16 - The active site of an enzyme:
Determined by structure and the specificity of the enzyme.
17 - Excessive increase in temperature of medium causes the enzyme molecule to
Denatured
18 - Extreme change in pH results in:
Denaturation of the enzyme
19 - 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
Inhibitor
20 - Inhibitors which block the enzyme by forming weak bond are called
Both a and b
21 - A substance which binds at the active site of the enzyme but does not result in the formation of the products is called:
Competitive inhibitor
22 - The structure of an enzyme is altered by:
Irreversible inhibitor
23 - Malonic acid is an example of:
Competitive inhibitor
24 - 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.
increase in concentration of enzyme
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