12 Jun Antibiotic treatment weakens one of the immune defenses
Question
HOMEWORK
3
Name
_____________________________________
ID
#
__________________________
Due
Monday,
July
25th
BEFORE
class
begins.
This
homework
is
worth
15
points.
Answers
must
be
hand-?written
on
this
form.
Only
legible
writing
within
the
boxes
will
be
graded.
You
may
discuss
the
questions
in
groups,
but
your
answers
must
be
from
your
own
work.
1.
(4
pts)
Antibiotic
treatment
weakens
one
of
the
immune
defenses
of
the
human
body.
a. Name
and
describe
this
defense.
b. Give
examples
of
two
(2)
mechanisms
by
which
this
defense
protects
the
host.
2.
(4
pts)
Some
viral
genomes
encode
proteins
that
repress
the
expression
of
MHC
genes
by
their
host
cells.
a.
Explain
how
MHC
molecules
are
involved
in
the
killing
of
virus-?infected
cells.
b.
Explain
how
repression
of
MHC
expression
facilitates
viral
replication.
MIC
102
001
SS1
Page 1 of 2
Last updated: 7/20/16
HOMEWORK
3
Name
_____________________________________
3.
(2
pts)
Diagram
the
CD4
count
over
time
in
an
HIV
infected
(solid
line)
and
uninfected
(dashed
line)
individual.
Infected$
Uninfected$
CD4$$T$cells$$
per$mL$
Time$
4.
(5
pts)
Name
and
briefly
describe
one
mechanism
by
which
a
bacterial
pathogen
can
overcome
each
of
the
following
immune
defenses
in
the
course
of
infection.
A. Gastric
acid
B. Death
by
phagocytosis
C. Complement
activation
D. Antibody
recognition
of
a
specific
pilus
protein
E. Exposure
to
circulating
antibodies
when
spreading
from
cell
to
cell
MIC
102
001
SS1
Page 2 of 2
Last updated: 7/20/16
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