Lec11PracProb

Lec11PracProb - Prac1ce
Problem


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Unformatted text preview: Prac1ce
Problem
 In
humans,
20%
of
bases
in
DNA
are
cytosine
(C).

What
 percentage
of
the
bases
are
expected
to
be
thymine
(T)?
 a.  b.  c.  d.  e.  20%
 25%
 30%
 40%
 80%
 Prac1ce
Problem
 What
would
Avery,
Macleod,
and
McCarty
have
concluded
if
 their
results
had
been
that
only
RNAse
treatment
of
the
heat‐ killed
bacteria
prevented
transformaKon
of
geneKc
virulence?
 a. 
that
DNA
was
the
gene1c
material
 b. 
that
RNA
was
the
gene1c
material
 c. 
that
protein
was
the
gene1c
material
 d. 
that
DNAse
or
protease,
but
not
RNase,
 s1mulates
transforma1on
 Prac1ce
Problem
 Suppose
that
Hershey
and
Chase
found
that
phage
ghosts
 contained
32P
label
but
the
label
was
absent
from
infected
 E.
coli.
Furthermore,
suppose
they
found
35S
lacking
in
the
 ghosts
and
present
in
the
infected
E.
coli.

They
would
have
 concluded:
 a.  that
protein
was
the
gene1c
material
in
phage.
 b.  that
DNA
was
the
gene1c
material
in
phage.
 c.  that
somehow
the
radioac1vity
prevented
DNA
 from
geFng
into
E.
coli.
 d.  that
protein
and
DNA
together
made
up
the
 gene1c
material.
 Prac1ce
Problem
 Which
is
true
of
the
secondary
structure
of
DNA?
 a.  Nitrogenous
bases
are
on
the
outside
of
the
DNA
 molecule.
 b.  Sugar–phosphate
groups
are
on
the
inside
of
the
 DNA
molecule.
 c.  Bases
on
complementary
strands
are
held
together
 by
phosphodiester
bonds.
 d.  %(C
+
G)
=
%(T
+
A).
 e.  The
paired
nucleo1de
strands
are
an1parallel.
 ...
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