WorksheetsWB Biology Keystone Review "Enzymes"
Total questions: 15
Worksheet time: 12mins
Name
Class
Date
1.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
2.
What type of macromolecule are enzymes?
a)
Protein
b)
Carbohydrate
c)
Lipid
d)
Nucleic Acid
3.
Enzymes need certain environmental conditions in order to function properly. What happens when enzymes are heated to a high temperature?
a)
they die
b)
they denature
c)
they change their amino acid sequence
d)
they work better
4.
The part of the enzyme that the substrate bonds to is called the _____.
a)
active site
b)
activation energy
c)
bond site
d)
peptide bond
5.
Which of these do NOT affect enzyme activity?
a)
Temperature
b)
pH
c)
concentration
d)
Carbohydrates
6.
Which of these is NOT true.
a)
Enzymes can denature (change shape) when the temperature gets too high.
b)
Enzymes can only be used once in a chemical reaction.
c)
Enzymes can denature when the pH changes.
d)
Enzymes speed up chemical reactions.
7.
Which of these is most likely an enzyme? (Based on the suffix)
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
8.
Which is NOT true?
a)
Enzymes speed up chemical reactions
b)
Enzymes react best at a specific temperature
c)
Enzymes only control ONE type of reaction
d)
Enzymes are made of lipids
9.
What is another name for enzymes?
a)
chemical catalyst
b)
microorganism
c)
biological catalyst
d)
catalyst
10.
Babies do not have well developed system to digest proteins, hence the baby food is prepared after treatement with which enzyme?
a)
protease
b)
lipase
c)
carbohydrase
d)
synthase
11.
What is the optimum pH of pepsin (found in the stomach gastric juice of humans)
a)
5
b)
2
c)
7
d)
9
12.
An enzyme acts as a catalyst to a chemical reaction by
a)
lowering the activation energy needed to get the reaction started.
b)
making one of the substrates needed for the reaction.
c)
regulating the temperature at which the reaction takes place.
d)
regulating the pH at which the reaction takes place.
13.
Enzymes provide a site where reactants called substrates can be brought together in an enzyme-catalyzed reaction. The site is called the
a)
enzyme substrate complex.
b)
reaction site.
c)
active site.
d)
lock and key.
14.
A lock and key is sometimes used as a model to promote understanding of enzymes. Which characteristic of enzymes or their action is best illustrated by this model?
a)
The sensitivity of enzymes to changes in pH
b)
The change in activation energy the enzymes cause
c)
The specificity of fit between an enzyme and a substrate
d)
The increase in reaction rate due to the action of the enzyme
15.
What is it called when an enzyme changes its shape?
a)
polar
b)
nonpolar
c)
dehydration synthesis
d)
denature
100 %
