Cell Biology exam 1 Dr. Kim FIU questions
with answers
For a motile eukaryotic cell, protrusion of the leading
edge (lamellipodia) requires ____ .
a. F-Actin synthesis
b. Myosin II activation
c. Microtubule dynamic instability
d. Ubiquitin modification on Actin - CORRECT ANSWERS
✔✔a. F-Actin synthesis
In humans, there are about 200 different types of cells.
Let's say that there are 50 trillion
cells in your body. On average, 50 billion cells die per day.
If there were no stem cells, our ..body would vanish in
____ days.
a. 10 days
b. 100 days
c. 1,000 days
d. 10,000 days - CORRECT ANSWERS ✔✔c. 1,000 days
Non-covalent bonds are critical in the regulation of
cellular events. Which of the following
, statement is correct?
a. Cells ensure constant pH by homeostasis mechanism
and so ionic bonds between
macromolecules are always constitutive.
b. Water molecules form H-bonds with the carbonyl group
of the polypeptide backbone
within the hydrophobic core of a stable globular protein.
c. Hydrophobic interaction is the only non-covalent
interaction between alpha-helices of a 7-
TM receptor.
d. H-bonds exist in a single pass transmembrane alpha-
helix. - CORRECT ANSWERS ✔✔d. H-bonds exist in a single
pass transmembrane alpha-helix.
Which of the following protein-protein interaction involves
ionic bond?
a. Growth factor - RPTK
b. RPTK - Ras
c. Growth factor -Ras
d. Activated growth factor receptor - Grb2 - CORRECT
ANSWERS ✔✔d. Activated growth factor receptor - Grb2
The side chain of amino acid Y is
(a) negatively charged
with answers
For a motile eukaryotic cell, protrusion of the leading
edge (lamellipodia) requires ____ .
a. F-Actin synthesis
b. Myosin II activation
c. Microtubule dynamic instability
d. Ubiquitin modification on Actin - CORRECT ANSWERS
✔✔a. F-Actin synthesis
In humans, there are about 200 different types of cells.
Let's say that there are 50 trillion
cells in your body. On average, 50 billion cells die per day.
If there were no stem cells, our ..body would vanish in
____ days.
a. 10 days
b. 100 days
c. 1,000 days
d. 10,000 days - CORRECT ANSWERS ✔✔c. 1,000 days
Non-covalent bonds are critical in the regulation of
cellular events. Which of the following
, statement is correct?
a. Cells ensure constant pH by homeostasis mechanism
and so ionic bonds between
macromolecules are always constitutive.
b. Water molecules form H-bonds with the carbonyl group
of the polypeptide backbone
within the hydrophobic core of a stable globular protein.
c. Hydrophobic interaction is the only non-covalent
interaction between alpha-helices of a 7-
TM receptor.
d. H-bonds exist in a single pass transmembrane alpha-
helix. - CORRECT ANSWERS ✔✔d. H-bonds exist in a single
pass transmembrane alpha-helix.
Which of the following protein-protein interaction involves
ionic bond?
a. Growth factor - RPTK
b. RPTK - Ras
c. Growth factor -Ras
d. Activated growth factor receptor - Grb2 - CORRECT
ANSWERS ✔✔d. Activated growth factor receptor - Grb2
The side chain of amino acid Y is
(a) negatively charged
