PCB3134 - Test 2
Spring, 2008
YOU WILL BE AWARDED 2 BONUS POINTS
ON THE EXAM IF YOU FOLLOW THESE
DIRECTIONS
DIRECTIONS
1. Enter your name and UFID number on your answer sheet,
BOTH PRINTED & FILL IN THE
BUBBLES.
2. Enter the five-digit test code number in slots
76-80
of your answer sheet.
The test code can be found at
the bottom of each page on your test.
IT IS IMPORTANT THAT THIS IS DONE CORRECTLY OR
YOUR TEST CANNOT BE GRADED
!!!
3. Answer each question with the
ONE BEST
answer.
4. Turn in your answer sheet when you have finished.
5.
KEEP YOUR TEST SO THAT YOU WILL HAVE THE TEST CODE NUMBER.
Grades will be
posted by test code numbers.
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READ EACH QUESTION CAREFULLY
.
Select the BEST ANSWER.
If you do not understand the
question, you may ask the instructor for clarification.
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1.
What kind of membrane protein(s) is/are found entirely outside the bilayer on the membrane's
cytoplasmic surface?
a.
monotopic integral protein
b.
lipid-anchored protein
c.
peripheral proteins
(*)
b, c
(2)
a, b, c
(3)
a, b
(4)
c
(5)
a
2.
What directly or indirectly determines the transition temperature?
(*)
a, b, c, d
(2)
a, c, d
(3)
b, c, d
(4)
b, c
(5)
c, d
3.
While culturing some cells, you lower the temperature of the culture.
What happens immediately to the
membrane fluidity?
(*)
The membrane becomes less fluid.
(2)
Nothing happens.
(3)
The membrane becomes more fluid..
(4)
The membrane fluidity fluctuates back and forth from high to low.
(5)
The membrane fluidity fluctuates back and forth from low to high
4.
Phospholipids have freedom of movement in the liquid crystal state of a cell membrane bilayer.
Which
type of movement occurs at the slowest rate?
(*)
transverse diffusion
(2)
lateral diffusion
(3)
rotation
(4)
flux
(5)
Each of the above types of movement occur at about the same rate.
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