Biology MCQs
Biology MCQs Test Preparation | Latest 2025 Quiz FPSC, NTS, KPPSC, PPSC, SPSC, BPSC, OTS, UTS, PTS, CTS, ATS, ETEA MCQs Test Questions.
A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?
A: Irreversible inhibitor
B: Reversible inhibitor
C: Competitive inhibitor
D: Non-competitive inhibitor
Competitive inhibitor
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_______________?
A: Co-enzyme
B: Blocker
C: Inhibitor
D: Cofactor
Inhibitor
Optimal temperature of enzymes present in human body is_____________?
A: 27?C
B: 37?C
C: 47?C
D: 30?C
37?C
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
Denaturation of the enzyme
Excessive increase in temperature of medium causes the enzyme molecule to____________?
A: Activate
B: Unaffected
C: Denatured
D: None of these
Denatured
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____________________?
A: increase in concentration of enzyme
B: increase in concentration of substrate
C: increase in pH
D: increase in temperature
increase in concentration of enzyme
In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?
A: Their physical properties like size & weight.
B: Physical properties of the medium like its density.
C: Their electrical properties like their charges
D: Both a and b
Both a and b
The structure of an enzyme is altered by____________?
A: Irreversible inhibitor
B: Reversible inhibitor
C: Competitive inhibitor
D: Non-competitive inhibitor
Irreversible inhibitor
Malonic acid is an example of____________?
A: Irreversible inhibitor
B: Reversible inhibitor
C: Competitive inhibitor
D: Non-competitive inhibitor
Competitive inhibitor