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WorksheetsTEKS 9A&C-Biomolecules/Enzymes
Total questions: 33
Worksheet time: 32mins
Name
Class
Date
1.
A substance with a pH of 6 is called
a)
an acid
b)
a base
c)
water
d)
a suspension
2.
What kinds of atoms are bonded to carbon atoms in the molecule shown?
a)
helium, oxygen, and nitrogen
b)
calcium, hydrogen, and oxygen
c)
hydrogen, oxygen, and nitrogen
d)
helium, carbon, and sodium
3.
Which statement is true about macromolecules?
a)
Simple sugars are made of
polysaccharides.
b)
Glycerol is made of fatty acids.
c)
Proteins are made of amino acids.
d)
Nucleotides are made of nucleic acids.
4.
An enzyme serves as a place where a chemical reaction can occur because-
a)
the enzyme is a substrate.
b)
the enzyme is one of the reactants in the reaction.
c)
the charge on the enzyme's active site is the same as the charge
on the substrates.
d)
the shape of the substrates fits perfectly into the shape of the
enzyme's active site.
5.
Most enzymes work best at about 37°C, normal body temperature, and each one
a)
is usually specific to only one type of chemical reaction in the body.
b)
serves as a catalyst for several kinds of reactions.
c)
helps speed up reactions by a factor of 2.
d)
helps slow down reactions by a factor of 10.
6.
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.
7.
How do enzymes control chemical reactions in the body?
a)
Enzymes speed up chemical reactions.
b)
Enzymes slow down chemical reactions.
c)
Enzymes increase the activation energy of a reaction.
d)
Enzymes inhibit the catalysts of a reaction.
8.
In addition to serving as waterproof coverings or as parts of biological membranes, lipids
a)
store glucose and other
sugars.
b)
store energy.
c)
transmit hereditary information.
d)
supply energy for chemical reactions.
9.
The ability of an enzyme to function properly depends on its environment. Unlike most enzymes in the human body, you would expect enzymes produced by the stomach to function best in an environment where
a)
the temperature is above normal body temperature.
b)
the acidity is very high.
c)
there are many other enzymes.
d)
the salt concentration is very high.
10.
four most common elements that make up all living things are carbon, hydrogen,
a)
nitrogen, and iron.
b)
oxygen, and nitrogen.
c)
calcium, and phosphorus.
d)
oxygen, and iron.
11.
The graph shows the effect of temperature on enzyme action. What characteristic do enzymes E1, E2, and E3 share?
a)
Their activity increases between 20°C and 30°C.
b)
Their activity is greatest between 5°C and 10°C.
c)
Their activity is at a low level between 15°C and 25°C.
d)
Their activity is at a high level between 30°C and 40°C.
12.
Which of the following would be considered the most important elements of life?
a)
potassium, nitrogen, phosphorus
b)
carbon, hydrogen, oxygen
c)
hydrogen, oxygen, helium
d)
oxygen, nitrogen, magnesium
13.
Which of the following describes the four major groups of biomolecules found in living things?
a)
Carbohydrates, lipids, nucleic acids, and proteins
b)
Carbohydrates, amino acids, proteins, and nitrogen bases
c)
Carbohydrates, monomers, polymers, and proteins
d)
None of the other answers are correct.
14.
Storing and transmitting genetic material is the function of which biomolecule?
a)
Nucleic acids
b)
Protiens
c)
Lipids
d)
Carbohydrates
15.
Enzymes are proteins that are found in cells. What is their role?
a)
They speed up chemical reactions in cells.
b)
They lower the activation energy needed for some reactions.
c)
They regulate the absorption of energy in chemical reactions.
d)
All the other answers are correct.
16.
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.
17.
A change in pH can change the shape of a protein. How might a change in pH affect the function of an enzyme?
a)
A new enzyme may be required to speed up the reaction.
b)
The enzyme may no longer be able to function for the substrate as a catalyst.
c)
The enzyme and substrate may no longer fit together so the enzyme cannot speed up the reaction.
d)
All the other answers are correct.
18.
The structure of biomolecules is closely related to the functions they perform in living cells. Which statement below best illustrates this concept?
a)
Lipids may be saturated or unsaturated.
b)
Carbohydrates such as starch are long chains of sugar monomers.
c)
The active site of a protein enzyme precisely fits the shape of
its substrate molecules.
d)
Proteins may be made up of chains that are folded or coiled.
19.
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
a)
Enzymes increase the energy of the
reactants.
b)
Enzymes decrease the energy level of
the products.
c)
Enzyme decrease the activation energy
of the reaction.
d)
Enzymes reverse the direction of the
reaction.
20.
Which of the following pairs of a biological monomer and one of its polymers is incorrect?
a)
Glucose and starch
b)
Fatty acids and carbohydrates
c)
Nucleotides and RNA
d)
Amino acids and proteins
21.
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
22.
What is a key difference between carbohydrates and proteins?
a)
Carbohydrates contain carbon; proteins do not.
b)
Proteins contain nitrogen; carbohydrates do not.
c)
Carbohydrates are biomolecules; proteins are not.
d)
Proteins contain covalent bonds; carbohydrates do not.
23.
The diagram shows a structural formula of a biomolecule. What is the most likely function of this biomolecule?
a)
Storing energy
b)
Fighting diseases
c)
Storing genetic information
d)
Forming waterproof coverings
24.
Which of the following is an example of a complex carbohydrate?
a)
Monosaccharides
b)
Starches
c)
Lipids
d)
Glucose
25.
What single question could be used to distinguish a lipid from a carbohydrate?
a)
What is the ratio of carbon to oxygen atoms in the molecule?
b)
Does the molecule contain hydrogen?
c)
Are oxygen atoms present in the molecule?
d)
Is this an organic molecule?
26.
A major function of fats, or lipids, is to
a)
store energy.
b)
speed up chemical reactions in the cell.
c)
contain instructions that cells need to carry out their
functions.
d)
provide one of the raw materials for photosynthesis.
27.
Identify this biomolecule.
a)
Carbohydrate
b)
Lipid
c)
Protein
d)
Nucleic acid
28.
Identify this monomer.
a)
Amino acid
b)
Glycerol
c)
Fatty acid
d)
Nucleic acid
29.
Identify this biomolecule
a)
Protein
b)
Lipid
c)
Carbohydrate
d)
Nucleic acid
30.
Identify this biomolecule
a)
Protein
b)
Lipid
c)
Carbohydrate
d)
Nucleic Acid
31.
Identify this monomer
a)
monosaccharide
b)
fatty acid
c)
amino acid
d)
nucleotide
32.
Identify this monomer
a)
monosaccharide
b)
fatty acid
c)
glycerol
d)
nucleotide
33.
Identify this polymer.
a)
Lipid
b)
DNA
c)
RNA
d)
Complex carbohydrate
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