WorksheetsTEKS 9A
Total questions: 23
Worksheet time: 22mins
Name
Class
Date
1.
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.
2.
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.
3.
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.
4.
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.
5.
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
6.
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.
7.
Storing and transmitting genetic material is the function of which biomolecule?
a)
Nucleic acids
b)
Protiens
c)
Lipids
d)
Carbohydrates
8.
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.
9.
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.
10.
An inhibitor such as pH, Temperature, or molecules can denature, or change the shape of a protein. How might these inhibitors 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.
11.
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.
12.
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
13.
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
14.
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.
15.
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
16.
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.
17.
Identify this biomolecule.
a)
Carbohydrate
b)
Lipid
c)
Protein
d)
Nucleic acid
18.
Identify this monomer.
a)
Amino acid
b)
Glycerol
c)
Fatty acid
d)
Nucleic acid
19.
Identify this biomolecule
a)
Protein
b)
Lipid
c)
Carbohydrate
d)
Nucleic acid
20.
Identify this biomolecule
a)
Protein
b)
Lipid
c)
Carbohydrate
d)
Nucleic Acid
21.
Identify this monomer
a)
monosaccharide
b)
fatty acid
c)
amino acid
d)
nucleotide
22.
Identify this monomer
a)
monosaccharide
b)
fatty acid
c)
glycerol
d)
nucleotide
23.
Identify this polymer.
a)
Lipid
b)
DNA
c)
RNA
d)
Complex carbohydrate
100 %
