IGCSE O Level Biology MCQs - Chapter 19

What Are Enzymes Quiz Questions and Answers PDF - 7

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MCQ 31: Salivary and pancreatic amylase help digest

proteins
starch
fats
minerals

MCQ 32: At a pH 7 to 9, the activity of amylase

stops
slows
expedites
ends

MCQ 33: Binding of enzyme and substrate on active site is explained through

hide and seek hypothesis
lock and hide hypothesis
lock and run hypothesis
lock and key hypothesis

MCQ 34: In fish, the large molecules are normally made up of

proteins and fats
Proteins and carbohydrates
Minerals and proteins
Minerals and Fats

MCQ 35: Using manganese oxide as a catalyst, in heating potassium chlorate (KClO₃), manganese oxide (Mn_xO_y)

evaporates
melts
remains unchanged
becomes magnesium carbonate

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