Bios 1700 Tanda
SI 9/17/14
Ch 5
1. You synthesize a phospholipid membrane that is extremely rigid. Its
phospholipid tails are likely composed of
a. Unsaturated fatty acids
b. Saturated fatty acids
c. An equal mixture of saturated and unsaturated fatty acids
d. Not enough information is given to answer.
2. The plasma membrane…. (select all that apply)
a. Separates the cell from its environment
b. Links the cell to its environment
c. Is an active participant in cellular function
d. Is a simple barrier
3. Can any molecules pass through the plasma membrane unaided?
4. What types of trans-membrane proteins transport molecules across the
membrane?
a. Carriers and channels
b. Channels and receptors
c. Enzymes and carriers
d. Receptors and enzymes
5. The two proteins you selected above are known as transport proteins. List
the other important types of trans-membrane proteins.
6. An hydrophilic protein temporarily associated with the plasma membrane is
a(n)
a. Integral transmembrane protein
b. Peripheral transmembrane protein
c. Enzyme
d. Anchor
7. Osmosis is the movement of (a)___________ across a(n) (b)______________
membrane. (a) crosses the membrane into an area of (c) ( higher / lower )
solute concentration. This difference in concentration is known as a(n)
(d)___________.
8. Primary active transport obtains its energy from _________, while secondary
active transport obtains its energy from _________.
a. ATP, the electrochemical gradient
b. The electrochemical gradient, GTP
c. GTP, the electrochemical gradient
d. The electrochemical gradient, ATP
9. What kind of transport does not require a molecular or electrochemical
energy source? What allows it to proceed?
10. What is an aquaporin? (What type of molecule is it? Where is it situated?
What is its function?)
11. Turgor is maintained by the pressure of water contained in _________ against
the ______________. Another word for turgor is ________ pressure.
a. Lysosomes, vacuoles, hydrostatic
b. Vacuoles, cell walls, hydrostatic
c. Cell walls, vacuoles, osmotic
d. Lysosomes, cell walls, osmotic
12. Choose the organelles involved in the endomembrane system.
a. Endoplasmic reticulum
b. Mitochondria
c. Vesicles
d. Lysosomes
e. Chloroplasts
f. Golgi apparatus
g. Vacuoles
13. What organelle is involved in polymer digestion?
14. Which organelles are present in plants but not in animals?
15. (a) In which organelle are proteins synthesized? (b) In which organelle are
proteins sorted? (c) Do these processes occur elsewhere, and if so, where?