Exam (elaborations)
BIOL275 Exam 3
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Name: Score:41 Multiple choice questions
Term 1 of 41
All of the following are active transporters except
permeases.
bacteriorhodopsin.
P-class pumps.
symporters.
ABC transporters.
Term 2 of 41
Refer to the figures to the right.
Name the common fatty acid and indicate whether the structure is saturated or unsaturated
18:1
C) gap junctions
Unsaturated (1 double bond)
Cis-oleate
Are often toxic to Cells
B) tight junctions
,Term 3 of 41
Which of the following molecules is most likely to cross the cell membrane directly by passive
diffusion?
insulin (a polypeptide)
fructose (a sugar)
Na+
fructose and insulin
a steroid hormone (a hydrocarbon)
Term 4 of 41
Which of the following would you expect to find predominating in the plasma membrane of a
unicellular eukaryotic organism thriving in glacier ice?
20C saturated fatty acids
18C saturated fatty acids
20C fatty acids with 1 double bond
18C fatty acids with 1 double bond
16C fatty acids with 3 double bonds
, Term 5 of 41
Cholesterol is a ________, which ________.
-steroid; is a component of eukaryotic membranes and is the basis for many animal and plant
hormones
-steroid; is the basis for many animal and plant hormones
-fatty acid; functions in energy storage
-terpene; is the basis for many animal and plant vitamins
-steroid; is a component of eukaryotic membranes
steroid; is a component of eukaryotic membranes and is the basis for many animal and
plant hormones
water diffuses through a semipermeable membrane toward a higher solute concentration.
buffers membrane fluidity by increasing fluidity at low temperature and decreasing fluidity
at high temperature.
increases glucose transport into the cell by increasing its concentration gradient across the
plasma membrane.
Term 6 of 41
Saturation can be defined as
A characteristic of all up catalyzed reactions
Inhibition of enzyme function by blocking the active site
Denaturation of an enzyme
Substrate concentration at which velocity reaches one-half maximum velocity
The inability to increase reaction velocity beyond a finite upper limit
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