Enzymes — Biology MCQs (Class 11)
Free chapter-wise Biology MCQs with answers for MDCAT, FSc and entry tests.
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#9 All enzymes are
A) Killed at low temperature
B) Vitamins
C) Globular in shape
D) Non sensitive to pH changes
#10 The rate of amylase decreases as the concentration of chloride ions is reduced. Which of the following describes the role of chloride ions?
A) Coenzyme
B) Cofactor
C) Apoenzyme
D) Inhibitor
#11 Which molecule is a cofactor used by dehydrogenase enzymes
A) Coenzyme - A
B) Cytochromes
C) Lactate
D) NAD
#12 The specificity of enzymes is due to
A) Their high molecular weight
B) Their pH sensitivity
C) Their surface configuration
D) Their hydrogen bonding
#13 Which of the following enzyme shows the greatest substracte specificity?
A) Lipase
B) Nuclease
C) Pepsin
D) Sucrase
#14 Which enzyme digests egg albumin into peptides and aminoacids best in alkaline medium
A) Catalase
B) Lipase
C) Pepsin
D) Trypsin
#15 Sometimes enzyme and substrate are held together by the kind of bone called
A) Ionic
B) Hydrogen
C) Hydrophobic
D) Covalent
#16 Which one of the following factors does not effect the rate of enzyme action
A) Enzyme conc.
B) Light Intensity
C) Temperature
D) Substrate conc.
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