BIOL2200 Mid Semester ( From Bb Module 1
& 2 ) Practice Questions With Complete
Solutions
________________________________________________ are
transmembrane proteins?
a. Lipid-anchored membrane proteins
b. Extracellular matrix proteins
c. Peripheral membrane proteins
d. Integral membrane proteins Correct Answers d.
Integral membrane proteins
"A genetically defined non-membrane suborganelle
that is formed as a result of ribosome biogenesis."
This statement BEST describes the Correct
Answers nucleoli
A cisternal, sheet-like architecture best describes
the ____________ endoplasmic reticulum, Correct
Answers rough
A growth factor receptor homodimer complex is an
example of protein _____________ structure. Correct
Answers Quaternary
A mutant channel protein is expressed in an
oocyte. Compared to patch clamping experiments
in oocytes expressing the normal channel, the
,length of downward deviations is diminished by
half. This indicates:
a.
the mutant channel doesn't stay open as long.
b.
the mutant channel doesn't make a functional
channel.
c.
the mutant channel opens more frequently.
d.
the mutant channel behaves the same as the wild-
type channel. Correct Answers the mutant
channel doesn't stay open as long.
A symporter would function as an antiporter if its
orientation in the membrane was reversed
(meaning the portion of the protein normally
exposed to the cytosol faced the outside of the cell
instead). Correct Answers False
A transmembrane protein has the following
properties: it has two binding sites, one for solute A
and one for solute B. The protein can undergo a
conformational change to switch between two
states: either both binding sites are exposed
exclusively on one side of the membrane, or both
are exposed exclusively on the other side of the
membrane. The protein can switch between the
two conformational states only if both binding sites
, are occupied or if both binding sites are empty, but
cannot switch if only one binding site is occupied.
What kind of binding site do these properties
define?
a.
uniporter
b.
ion channel
c.
aniporter
d.
symporter Correct Answers d. symporter
Acetylation of histones promotes tight packaging of
DNA resulting in condensed chromatin structures.
Correct Answers False
Active transport is: Correct Answers movement of
a molecule across a membrane that is driven by
ATP hydrolysis or some other form of metabolic
energy
All the following statements describe
biomembranes except
a. Some phospholipids and cholesterol may cluster
to form lipid rafts.
& 2 ) Practice Questions With Complete
Solutions
________________________________________________ are
transmembrane proteins?
a. Lipid-anchored membrane proteins
b. Extracellular matrix proteins
c. Peripheral membrane proteins
d. Integral membrane proteins Correct Answers d.
Integral membrane proteins
"A genetically defined non-membrane suborganelle
that is formed as a result of ribosome biogenesis."
This statement BEST describes the Correct
Answers nucleoli
A cisternal, sheet-like architecture best describes
the ____________ endoplasmic reticulum, Correct
Answers rough
A growth factor receptor homodimer complex is an
example of protein _____________ structure. Correct
Answers Quaternary
A mutant channel protein is expressed in an
oocyte. Compared to patch clamping experiments
in oocytes expressing the normal channel, the
,length of downward deviations is diminished by
half. This indicates:
a.
the mutant channel doesn't stay open as long.
b.
the mutant channel doesn't make a functional
channel.
c.
the mutant channel opens more frequently.
d.
the mutant channel behaves the same as the wild-
type channel. Correct Answers the mutant
channel doesn't stay open as long.
A symporter would function as an antiporter if its
orientation in the membrane was reversed
(meaning the portion of the protein normally
exposed to the cytosol faced the outside of the cell
instead). Correct Answers False
A transmembrane protein has the following
properties: it has two binding sites, one for solute A
and one for solute B. The protein can undergo a
conformational change to switch between two
states: either both binding sites are exposed
exclusively on one side of the membrane, or both
are exposed exclusively on the other side of the
membrane. The protein can switch between the
two conformational states only if both binding sites
, are occupied or if both binding sites are empty, but
cannot switch if only one binding site is occupied.
What kind of binding site do these properties
define?
a.
uniporter
b.
ion channel
c.
aniporter
d.
symporter Correct Answers d. symporter
Acetylation of histones promotes tight packaging of
DNA resulting in condensed chromatin structures.
Correct Answers False
Active transport is: Correct Answers movement of
a molecule across a membrane that is driven by
ATP hydrolysis or some other form of metabolic
energy
All the following statements describe
biomembranes except
a. Some phospholipids and cholesterol may cluster
to form lipid rafts.
