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Dr. Madison's MCB 2010 Lecture Exam
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- NUR 240 EXAM 2 Practice Questions.
Dr. Madison's MCB 2010 Lecture Exam
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Dr. Madison's MCB 2010 Lecture Exam 1A gram-positive bacterium suddenly acquires resistance to the antibiotic methicillin. This
trait most likely occurred due to acquisition of new genetic information through - ANS-A
conjugation
A strictly fermentative bacterium produces energy - ANS-A by glycolysis only
A urease test is used to identify Mycobacterium tuberculosis because - ANS-B) M.
tuberculosis produces urease.
An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP. This is an example
of all of the following EXCEPT - ANS-B) competitive inhibition.
Antibiotics that target cell wall sysntheisi ultimately cause bacterial cell death as a result
of - ANS-A osmotic lysis
Assume you are growing bacteria on a lipid medium that started at pH 7. The action of
bacterial lipases should cause the pH of the medium to - ANS-B) decrease.
Assume you are working for a chemical company and are responsible for growing a
yeast culture that produces ethanol. The yeasts are growing well on the maltose
medium but are not producing alcohol. What is the most likely explanation? - ANS-B)
O2 is in the medium.
Bacteria are a commonly used organism for studies of genetic material in the research
laboratory. The nucleic acids must first be isolated from the cells for these studies.
Which of the following would most lykely be used to lyse gram-positive bacterial cells for
nucleic acid - ANS-A lysozyme
By which of the following mechanisms can a cell transport a substance from a lower to a
higher concentration? - ANS-C active transport
Cyanobacteria are a type of - ANS-C) photoautotroph.
During which growth phase will gram-positive bacteria be most susceptible to penicillin?
- ANS-B) log phase
, Each of the following statements concerning the gram-positive cell wall is true EXCEPT
- ANS-C it protects the cell in a hypertonic environment
Fatty acids are oxidized in - ANS-A the Krebs cycle
Figure 6.1, which line best depicts a facultative anaerobe in the absence of O2? -
ANS-B) b
Figure 6.2 shows a typical bacterial growth curve with the y-axis indicating the log of the
number of bacteria and the x-axis indicating time in culture. In the figure, which section
(or sections) shows a growth phase where the number of cells dying equals the number
of cells dividing? - ANS-C) c (middle)
Figure 6.2 shows a typical bacterial growth curve with the y-axis indicating the log of the
number of bacteria and the x-axis indicating time in culture. In the figure, which sections
of the graph illustrate a logarithmic change in cell numbers? - ANS-B) b and d
Fimbriae and pili differ in that - ANS-D pili are used for transfer of DNA and motility
Functions of the glycocalyx include all of the following except - ANS-E binary fission
How do spirochetes and spirilla differ? - ANS-C Spirilla have external flagella but
spirochetes have axial filaments
How is ATP generated in the reaction shown in figure 5.4 - ANS-E substrate-level
phosphorylation
How would a noncompetitive inhibitor interfere with a reaction involving the enzyme
figure 5.3 - ANS-B it would bind to b
If cells are grown in media containing amino acids labeled with radioactive nitrogen
(15N), most of the radioactivity will be found in the cells' - ANS-D) DNA and proteins.
In a hypertonic solution, a bacterial cell will typically - ANS-D plasmolyze
In bacteria, photosynthetic pigments are found in - ANS-C chromatophores
In figure 4.2 which diagram of a cell wall contains porins? - ANS-B
In figure 4.2 which diagram of a cell wall contains teichoic acids? - ANS-A
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