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WorksheetsIB Enzymes #1
Total questions: 21
Worksheet time: 2hrs 32mins
Name
Class
Date
1.
What is structure D?
a)
substrate
b)
active site
c)
enzyme
d)
products
2.
Which of the following is NOT a common misconception about enzymes?
a)
they are reusable
b)
there are only a few kinds of enzyme that work in our bodies
c)
an enzyme only facilitates one reaction and then it is broken down and reabsorbed
d)
enzymes make chemical reactions occur
3.
Letter D is....
a)
active site
b)
enzyme
c)
substrate
d)
products
4.
Letter C is ....
a)
active site
b)
enzymes
c)
substrate
d)
products
5.
Which of the following is NOT true about enzymes?
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 polysaccharides
6.
What can influence enzyme productivity?
a)
pH
b)
temperature
c)
both pH and temperature
d)
nothing influences enzyme productivity
7.
What makes an enzyme substrate specific?
a)
size
b)
shape
c)
name
d)
location it is found in
8.
What is the optimum pH of pepsin which is found in the stomach gastric juice of humans?
a)
pH 5
b)
pH 2
c)
pH 7
d)
pH 9
9.
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
10.
What is broken down by the enzyme amylase, which is found in saliva?
a)
sugar
b)
starch
c)
oils
d)
protein
11.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
12.
Enzymes are proteins that help increase the rate of chemical reactions inside cells. These proteins are composed of many simpler molecules called amino acids. Which of the following suggests that the shape of an enzyme determines the enzyme’s function?
a)
Enzymes are specific to a substrate
b)
Enzymes can operate in a wide range of conditions
c)
Enzymes are activated by neighboring molecules
d)
Enzymes can be found in all life-forms
13.
Enzymes speed up reaction rates by changing...
a)
activation energy
b)
pH
c)
hydrogen Bonds
d)
kinetic energy
14.
When a molecule can occupy the same active site as the substrate, a situation called __________________ can result
a)
competitive inhibition
b)
allosteric regulation
c)
non-competitive Inhibition
d)
feedback inhibition
15.
Which enzyme is most efficient in a basic (alkaline) solution?
a)
A
b)
B
c)
both are equally efficeint
d)
neither are efficient in a basic solution
16.
Enzymes catalyze reactions by ___________ activation energy.
a)
increasing
b)
decreasing
c)
introducing
d)
removing
17.
Increasing substrate concentration increases the rate of reaction. This is because....
a)
less substrate molecules will be colliding with enzyme molecules, so less product will be formed
b)
more substrate molecules will be colliding with enzyme molecules, so more product will be formed
c)
the temperature will increase, resulting in faster reactions
d)
the rate of denaturation of enzymes will decrease
18.
At high temperatures enzyme activity declines because of....
a)
denaturation
b)
decreased kinetic motion
c)
increased hydrogen-bonding
d)
dissociation of ionic compounds
19.
Venus flytraps produce chemicals that break down insects into usable compounds. These chemicals are most likely.....
a)
hormones
b)
lipids
c)
enzymes
d)
carbohydrates
20.
The enzyme known as ‘catalase’ is involved in the breakdown of hydrogen peroxide molecules into separate water and oxygen molecules. During this reaction, what happens to the ‘catalase’?
a)
the enzyme would become products: O2 and H2O
b)
the enzyme would be fully used up and discarded
c)
the enzyme would remain unchanged in any way
d)
the enzyme would become a new type of enzyme
21.
By what chemical process are enzymes synthesized?
a)
polymerization of carbohydrates
b)
condensation reaction between fatty acids and glycerol
c)
peptide bonding of amino acids
d)
hydrolysis of polysaccharides
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