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WorksheetsProtein and Enzyme
Total questions: 15
Worksheet time: 7mins
A reaction takes place because the active site of an enzyme is complementary to
one type of substrate molecule
all types of substrate molecule
one type of product molecule
all types of product molecules.
Enzymes act as catalysts because they
are composed of protein
act on any substrate
are unaffected by temperature
speed up chemical reactions in cells.
All enzyme molecules are composed of
carbohydrates
fatty acids
glycerol
proteins
Proteins have different functions. Which of the following statements identifies a protein and its function?
Hormones carry oxygen around the body.
Enzymes carry chemical messages around the body
Antibodies defend the body against disease.
Cellulose provides strength and structure to a plant cell wall.
Which of the following are all types of proteins?
Hormones, enzymes and nitrates
Antibodies, enzymes and plasmids
Hormones, receptors and antibodies
Receptors, antibodies and nitrates
The substrate of catalase would be
Hydrogen peroxide
Glucose-1-phosphate
oxygen and water
Maltose
Which of these are proteins
Hormones
Antibodies
Receptors
Enzymes
Synthesis reactions are breaking down reactions
TRUE
FALSE
How can we make experiment results more reliable?
(a)
Glucose-1-phoshate is synthesised into starch by which enzyme?
Amylase
Catalase
Phosphorylase
Lactase
What happens to enzymes at high temperatures?
degraded
denatures
defected
defended
What happens to an enzyme when it is denatured?
It changes to become a different chemical
It begins to hate nature
The shape of the active site remains the same
The shape of the active site is changed
What does optimum pH mean?
enzymes have a pH at which they are most active
Enzymes have a pH where they don't work at all
Enzymes work in a higher pH range
Enzymes work in a lower pH range
What would be the optimum pH of pepsin (found in the stomach)?
Pepsin has an optimum of pH 14
Pepsin has an optimum of pH 2.8
Pepsin has an optimum of pH 7
Pepsin has an optimum of pH 9
Different enzymes have different optimum ranges of pH at which they function
TRUE
FALSE
