DAYDIF ASU MIC 205 EXAM 1 NEWEST
ACTUAL EXAM QUESTIONS AND
DETAILED CORRECT ANSWERS |
ALREADY GRADED A+
Peptidoglycans are composed of sugars and _____
Correct Answer amino acids
One chain of alternating NAGs and NAMs is connected to
another chain via _____. Correct Answer tetrapeptides
One of the main differences between a Gram-positive and
a Gram-negative bacterial cell wall is that the
peptidoglycan portion of a Gram-positive cell wall is _____
as compared to a Gram-negative cell wall. Correct Answer
thicker
Within the peptidoglycan layer, the crossbridges that
connect the chains of alternating sugar molecules extend
between _____. Correct Answer two N-acetylmuramic
acid molecules
The peptidoglycan cell wall of bacteria is most analogous
to _____. Correct Answer a chain-link fence
What role do the teichoic acids play within the cell wall of
Gram-positive bacteria? Correct Answer They serve to
stabilize the cell wall and hold it in place.
,The region between the outer and inner membranes of a
Gram-negative bacterial cell is known as the __________,
and it is the location of enzymes that assemble
peptidoglycan. Correct Answer periplasmic space
A patient is infected with Gram-negative bacteria and is
experiencing only mild symptoms. When the patient is
given an antibiotic causing lysis of the bacterial cells, he
suddenly experiences an increase in inflammation and
fever, as well as the formation of blood clots. What
explanation best describes what happened? Correct
Answer The lysis of the cells releases lipid A from the
lipopolysaccharide layer.
Which of the following molecules would be blocked by a
cell membrane? Correct Answer Ions
Hydrophobic molecules move across a membrane Correct
Answer by passive transport directly across the
membrane.
What is a hallmark of passive transport across cell
membranes? Correct Answer It occurs along an
electrochemical gradient, and may involve the use of
transport proteins.
A positively charged sodium ion Correct Answer would
require the use of integral protein channels to pass
through a cell membrane.
, In 1861, Pasteur conducted his now-famous experiments
using flasks with long necks bent into an S-shape. Imagine
that you are a scientist working in Pasteur's lab at this
time. You decide to tip the flasks so that broth enters the
long S-shaped neck. You then return the flask to its
upright position. Predict the most likely outcome of tipping
one of Pasteur's S-necked flasks. Correct Answer The
broth would become contaminated with microbes because
they were trapped in the neck.
S. aureus has been isolated from George's infected
wound. To satisfy Koch's postulates, what would George's
doctor need to do with the isolated S. aureus? Correct
Answer Inject the S. aureus into an animal, observe
whether the animal gets an infection similar to George's,
and isolate the same strain of S. aureus from the infection.
Which of the following are limitations of antibiotics?
Correct Answer Antibiotics are not effective in treating viral
infections.
Treatment with antibiotics can lead to the emergence of
resistant strains.
Antibiotics may be toxic.
Further characterization of the S. aureus isolated from
George's wound reveals that the strain is MRSA. Why is
George's doctor concerned that MRSA has been identified
as the causative agent of George's infection? Correct
Answer MRSA is transmissible.
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