Download Enzyme MCAS Practice Name: Date: 1. There are many different

Enzyme MCAS Practice
Name:
1.
Date:
There are many di erent enzymes located in the
cytoplasm of a single cell. How is a speci c
enzyme able to catalyze a speci c reaction?
A.
Di erent enzymes are synthesized in speci c
areas of the cytoplasm.
B.
Most enzymes can catalyze many di erent
reactions.
C.
An enzyme binds to a speci c substrate
(reactant) for the reaction catalyzed.
5.
6.
Some snake venoms are harmful because they
contain enzymes that destroy blood cells or tissues.
The damage caused by such a snakebite could best
be slowed by
4.
size of a given amino acid can vary.
B.
chemical composition of a given amino acid
can vary.
C.
sequence and number of amino acids is
di erent.
Baby food manufacturers sometimes use proteases
in their products. Proteases catalyze the breakdown
of the proteins in these foods, making digestion
easier for infants.
Proteases are which of the following types of
molecules?
A.
applying ice to the bite area.
B.
drinking large amounts of water.
A.
enzymes
B.
C.
inducing vomiting.
C.
hormones
D. monosaccharides
D. increasing blood ow to the area.
3.
A.
D. same amino acid can have many di erent
properties.
D. Enzymes are transported to speci c substrates
(reactants) by ribosomes.
2.
Although there are a limited number of amino
acids, many di erent types of proteins exist
because the
7.
Maltose can be broken down into glucose
molecules by the enzyme maltase. Which of the
following would slow the reaction rate?
A.
adding maltase
B.
adding maltose
C.
removing glucose
D. diluting with water
fatty acids
The clear protein of an egg white becomes opaque
and rm when cooked because the heat
A.
mutates the DNA.
B.
turns the protein into carbohydrates.
C.
stops protein formation.
D. changes the protein structure.
The role of an enzyme in a chemical reaction is
to change which of the following?
8.
Proteins are large macromolecules composed of
thousands of subunits. The structure of the protein
depends on the sequence of
A.
the type of reaction
B.
the activation energy of the reaction
A.
lipids.
B.
C.
the pH at which the reaction occurs
C.
amino acids.
D. nucleosides.
D. the temperature at which the reaction occurs
page 1
monosaccharides.
9.
10.
11.
12.
13.
What types of monomers form proteins?
A.
Glucose
B.
C.
Amino acids
D. Polyatomic ions
14.
Nucleotides
In red blood cells, the compound carbonic
anhydrase increases the rate at which carbon
dioxide is converted to bicarbonate ions for
transport in the blood. In red blood cells, carbonic
anhydrase acts as which of the following?
A.
an enzyme
B.
C.
a lipid
D. a sugar
15.
Many plants have waxy coatings on some surfaces.
This coating reduces water loss because it is not
water-permeable. This waxy coating is which of
the following types of organic molecule?
carbohydrate
B.
C.
nucleic acid
D. protein
16.
Some bacteria contain a substance called
nitrogenase. Nitrogenase catalyzes the chemical
reaction that converts atmospheric nitrogen (N2 )
into ammonia (NH3 ). Nitrogenase is an example
of which of the following?
a sugar
B.
C.
a nucleotide
D. an amino acid
an enzyme
Which of the following categories of organic
molecules is correctly paired with one of its
functions?
A.
nucleic acids—digest dead cells
B.
lipids—give quick energy to cells
C.
carbohydrates—store genetic information
Carbohydrates are broken down in cells for
energy.
B.
Carbohydrates combine to form many di erent
proteins.
C.
Carbohydrates act as catalysts to speed up
chemical reactions.
Acetylcholine is an important chemical signal
in the nervous system. Once acetylcholine is
released, it is quickly broken down into other
chemicals because of the activity of cholinesterase.
Cholinesterase is which of the following?
lipid
A.
A.
D. Carbohydrates are the building blocks for cell
growth and repair.
a hormone
A.
Which of the following is the main reason that
humans need to include carbohydrates in their
diet?
A.
a hormone
B.
a lipid
C.
an enzyme
D. an organelle
Which of the following best explains why enzymes
are necessary for many cellular reactions?
A.
Enzymes supply the oxygen necessary for the
reactions.
B.
Enzymes change reactants from solid to liquid
during the reactions.
C.
The reactions take up too much space in the
cell if enzymes are missing.
D. The reactions are too slow to meet the needs
of the cell if enzymes are missing.
17.
D. proteins—provide structure in skin, hair, and
nails
page 2
In the human body, brinogen is necessary for
sealing cuts and stopping the loss of blood. Since
brinogen is made of chains of amino acids, it is
an example of which type of organic molecule?
A.
carbohydrate
B.
protein
C.
fatty acid
D. nucleic acid
Enzyme MCAS Practice
18.
Which of the following statements describes a
DNA molecule?
23.
The graph below shows how the activity of an
enzyme changes over a range of pH values.
Enzyme Activity
A.
It contains the base uracil.
B.
It has a double helix shape.
C.
It contains
nucleotide.
ve phosphate groups per
D. It has a backbone of twenty di erent
nucleotides.
19.
The diagram below shows a pair of DNA
nucleotides. The nitrogenous base guanine (G) is
labeled.
Which nitrogenous base pairs with guanine?
20.
21.
22.
A.
adenine (A)
B.
C.
thymine (T)
D. uracil (U)
Which of the following conclusions is supported
by the data?
cytosine (C)
The enzyme lactase will break down the sugar
lactose into which of the following components?
A.
Monosaccharides
B.
C.
Amino acids
D. Phospholipids
24.
RNA and DNA are which type of organic
compound?
carbohydrate
B.
C.
nucleic acid
D. protein
lipid
ATP
B.
DNA
C.
B.
The optimum pH of the enzyme is 5.8.
C.
The enzyme's activity is greater around
pH 8.0 than around pH 5.0.
Proteins that regulate chemical reactions in the
body but remain unchanged by the reaction are
known as—
A.
lymphocytes.
B.
cytoplasm.
C.
mitochondria.
D. enzymes.
25.
Which substance provides the instructions for
producing proteins?
A.
The optimum pH of the enzyme is 6.6.
D. The enzyme's activity continually increases as
pH increases from 5.0 to 9.0.
Nucleic acids
A.
A.
H2 O
In the diagram above, the substance labeled X is
most likely—
page 3
A.
an enzyme.
B.
water.
C.
ATP.
D. oxygen.
Enzyme MCAS Practice
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Enzyme MCAS Practice
10/10/2016
1.
Answer:
C
21.
Answer:
C
2.
Answer:
A
22.
Answer:
B
3.
Answer:
D
23.
Answer:
A
4.
Answer:
B
24.
Answer:
D
5.
Answer:
C
25.
Answer:
A
6.
Answer:
A
7.
Answer:
D
8.
Answer:
C
9.
Answer:
C
10.
Answer:
A
11.
Answer:
B
12.
Answer:
B
13.
Answer:
D
14.
Answer:
A
15.
Answer:
C
16.
Answer:
D
17.
Answer:
B
18.
Answer:
B
19.
Answer:
B
20.
Answer:
A