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WorksheetsMedical Biology_Mock Test #4
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
The process of stabilizing the structure of an enzyme in its active form by the binding of a molecule outside the active site is an example of __________.
a)
allosteric activation
b)
noncompetitive inhibition
c)
Cooperativity
d)
competitive inhibition
e)
feedback inhibition
2.
Which of the following statements about allosteric proteins is/are true?
a)
They exist in active and inactive conformations.
b)
They are sensitive to environmental conditions.
c)
They are acted on by inhibitors.
d)
All of the first three listed responses are correct.
e)
None of the first three listed responses is correct.
3.
The binding of an allosteric inhibitor to an enzyme causes the rate of product formation by the enzyme to decrease. Which of the following best explains why this decrease occurs?
a)
The allosteric inhibitor binds to the substrate and prevents it from binding at the active site.
b)
The allosteric inhibitor binds to the active site, preventing the substrate from binding.
c)
The allosteric inhibitor causes free energy change of the reaction to increase.
d)
The allosteric inhibitor causes a structural change in the enzyme that prevents the substrate from binding at the active site.
e)
The allosteric inhibitor lowers the temperature of the active site.
4.
What enzyme joins Okazaki fragments?
a)
Helicase
b)
DNA polymerase
c)
Primase
d)
DNA ligase
e)
Topoisomerase
5.
At each end of a DNA replication bubble is __________.
a)
a telomere
b)
an origin of replication
c)
a ribosome
d)
a replication fork
e)
a gene
6.
After the formation of a replication bubble, which of the following is the correct sequence of enzymes used for the synthesis of the lagging DNA strand?
a)
Primase, helicase, DNA polymerase, ligase
b)
Helicase, primase, ligase, DNA polymerase
c)
Helicase, DNA polymerase, primase, ligase
d)
Ligase, primase, DNA polymerase, helicase
e)
Helicase, primase, DNA polymerase, ligase
7.
Where do the reactions of the citric acid cycle occur in eukaryotic cells?
a)
The intermembrane space of the mitochondrion
b)
Across the inner membrane of the mitochondrion
c)
The matrix of the mitochondrion
d)
The cytosol
e)
The cristae of the mitochondrion
8.
How many molecules of ATP are gained by substrate-level phosphorylation from the complete breakdown of a single molecule of glucose in the presence of oxygen?
a)
4.0
b)
About 16 ATP
c)
3.0
d)
2.0
e)
About 32 ATP
9.
Which of the following represents the major energy-related accomplishment of the citric acid cycle, even though it is not the only energy-related accomplishment?
a)
Formation of CO2
b)
Completion of substrate-level phosphorylation
c)
Formation of NADH and FADH2
d)
Utilization of O2
e)
Formation of ATP
10.
The starting point of the Kreb's Cycle
a)
Acetyl CoA and Citrate
b)
Oxaloacetate and Acetyl CoA
c)
Acetyl CoA and Isocitrate
d)
Acetyl CoA and CO2
e)
Not correct response
11.
The products of a single turn of Citric Acid Cycle.
a)
(1) CO2, (3) NADH, (1) FADH2, (1) GTP
b)
(2) CO2, (1) NADH, (3) FADH2, (1) GTP
c)
(4) CO2, (3) NADH, (1) FADH2, (1) GTP
d)
(2) CO2, (3) NADH, (1) FADH2, (1) GTP
e)
Not correct response
12.
What products of glucose oxidation are essential for oxidative phosphorylation?
a)
Acetyl CoA
b)
Pyruvate
c)
NADH and FADH2
d)
NADPH and ATP
e)
Not correct response
13.
How are electrons extracted from the citric acid cycle for use in the electron transport chain?
a)
Reduction of ATP and GTP
b)
Reduction of NAD+ and FAD
c)
Oxidation of NAD+ and FAD
d)
Oxidation of ATP and GTP
e)
Not correct response
14.
You would expect a cell with an extensive Golgi apparatus to __________.
a)
make large amounts of ATP
b)
move rapidly
c)
absorb nutrients in the GI tract
d)
store large quantities of ions
e)
secrete large amounts of protein
15.
A researcher made an interesting observation about a protein made by the rough endoplasmic reticulum and eventually found in a cell's plasma membrane. The protein in the plasma membrane was actually slightly different from the protein made in the ER. The protein was probably altered in the __________.
a)
rough endoplasmic reticulum
b)
smooth endoplasmic reticulum
c)
Golgi apparatus
d)
transport vesicles
e)
plasma membrane
16.
Consider a protein that is made in the rough endoplasmic reticulum. You observe that when the synthesis of the protein is completed, the protein is located in the ER membrane. Where else in the cell might this protein be found?
a)
In the internal space of the Golgi apparatus, being modified before the protein is excreted
b)
Embedded in the plasma membrane, functioning in the transport of molecules into the cell
c)
In a mitochondrion, functioning in ATP synthesis
d)
In the aqueous interior of a lysosome, functioning as a digestive enzyme
e)
In the cytoplasm, functioning as an enzyme in carbohydrate synthesis
17.
One of the autosomal loci controlling eye color in fruit flies has two alleles: one for brown eyes and the other for red eyes. Fruit flies from a true-breeding line with brown eyes were crossed with flies from a true-breeding line with red eyes. The F1 flies had red eyes. What conclusion can be drawn from this experiment?
a)
these alleles underwent independent assortment
b)
these alleles underwent segregation
c)
these genes are X-linked
d)
the allele for red eyes is dominant to the allele for brown eyes
e)
all the preceding are true
18.
The F1 flies described in question 1 were mated with browneyed flies from a true-breeding line. What phenotypes would you expect the offspring to have?
a)
all with red eyes
b)
All with brown eyes
c)
half with red eyes and half with brown eyes
d)
red-eyed females and brown-eyed males
e)
browneyed females and red-eyed males
19.
The type of cross described in question 2 is
a)
an F2 cross
b)
a dihybrid cross
c)
a test cross
d)
a two-point test cross
e)
none of the preceding
20.
Individuals of genotype AaBb were crossed with aabb individuals. Approximately equal numbers of the following classes of offspring were produced: AaBb, Aabb, aaBb, and aabb. These results illustrate Mendel’s principle(s) of
a)
linkage
b)
independent assortment
c)
segregation
d)
a and c
e)
b and c
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