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Pre-Assessment Test Questions With Correct Answers Graded A+
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Pre-Assessment Test Questions With CorrectAnswers Graded A+
What is the reason that linked genes are inherited together? - Answer They are located
close together on the same chromosome.
Which of the following statements is a correct distinction between autotrophs and
heterotrophs? - Answer Autotrophs, but not heterotrophs, are capable of nourishing
themselves starting with CO2 and other nutrients that are inorganic.
Choose the best description of the cell cytoskeleton.
A. The cytoskeleton of a cell is dynamic in nature and can be rapidly dismantled and
rebuilt to alter the cell shape as well as the position of the cell organelles.
B. The cytoskeleton of a cell provides a permanent framework to fasten the cell
organelles in place inside the cell cytoplasm.
A. The cell cytoskeleton is a dynamic network of fibers that can be readily dismantled and
reassembled to effect changes in cell shape and the position of cell components. -C. In
providing rigid internal support and structure to the cell, the cell cytoskeleton is
analogous to the skeleton of an animal.
The bacterium that causes cholera, Vibrio cholerae produces an enzyme toxin that
chemically modifies a G protein involved in regulating salt and water secretion in
intestinal cells. Stuck in its active form, the modified G protein stimulates production of a
high concentration of cAMP leading to massive secretion of salts by the intestinal cells
and water follows the salts by osmosis through the intestines. An infected person rapidly
develops massive diarrhea and, if untreated, can quickly die from the loss of water and
salts. What is the basic effect of the cholera toxin?
A. The basic effect of the cholera toxin is loss of specificity of the response of intestinal
cells to a signaling molecule.
, B. The basic effect of the cholera toxin is premature termination of a signaling pathway.
C. The basic effect of the cholera toxin is signal amplification.
Answer C. The basic effect of the cholera toxin is signal amplification.
What is the difference between a virus and a bacterium?
I. A virus, unlike a bacterium, has no genome.
II. Viruses are two-dimensional, whereas bacteria are three-dimensional.
III. Unlike bacteria, viruses lack metabolic enzymes. -Answer III. Unlike bacteria, viruses
lack metabolic enzymes.
Cold case detectives are reinvestigating a murder that took place 30 years ago. Upon
reanalysis of the evidence, a small bloodstain is found on the victim's clothing that likely
belongs to the murderer. The DNA in the blood is partially degraded due to the passage
of time. Which method(s) would the blood lab technicians use in the analysis of this
small, degraded blood sample?
Select all that apply. - Answer They would use PCR to amplify the DNA.
How are genes coordinately controlled in eukaryotic cells?
A) Coordinately controlled genes in eukaryotic cells are located together on the same
chromosome.
B) Coordinately controlled genes in eukaryotic cells are activated by the same chemical
signals.
C) Coordinately controlled genes in eukaryotic cells share a set of control elements. -
Answer B) Coordinately controlled genes in eukaryotic cells are activated by the same
chemical signals and
C) Coordinately controlled genes in eukaryotic cells share a set of control elements.
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