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BL1020 Ch 5 Exam Latest Update
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BL1020 Ch 5 Exam Latest Update ...
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BL1020 Ch 5 Exam LatestUpdate
The lipid layer that forms the foundation of cell membranes is primarily composed of
molecules called __________.
A. phospholipids
B. fats
C. proteins
D. carbohydrates - Answer A. phospholipids
While water continually orients phospholipids into a lipid bilayer, it does not fix the lipids
permanently into position. Thus, the bilayer is considered to be _______.
A. static
B. fluid
C. fluctuating
D. charged - Answer B. fluid
What is the net movement of substances to regions of lower concentration called?
A. Osmosis
B. Active transport
C. Facilitation
D. Diffusion - Answer D. Diffusion
Osmosis is the diffusion of water across a membrane in response to the concentration
of one or more of the ______.
A. solutes
B. membranes
C. compartments
D. cells - Answer A. solutes
Which type of proteins is embedded in the cell membrane in both active transport and
, facilitated transport?
A. carrier
B. cytoskeletal
C. structural
D. targeted - Answer A. carrier
Osmosis occurs as water can cross the lipid bilayer through specialized channels for
water movement called ________________.
A. proteins
B. transmembrane carbohydrates C. membrane pores
D. aquaporins - Answer D. aquaporins
The plasma membrane is a thin sheet of lipid embedded with
A. proteins.
B. carbohydrates.
C. polymers.
D. nucleotides.
E. sodium and potassium ions. - Answer A. proteins.
If a cell has the same concentration of dissolved molecules as its outside environment,
the cell's condition is referred to as being
A. isotonic.
B. hypertonic.
C. hypotonic.
D. hydrophobic.
E. hydrophilic. - Answer A. isotonic.
type of transport of a solute across a membrane, up its concentration gradient, using
protein carriers driven by the expenditure of chemical energy is known as
A. osmosis.
B. diffusion.
C. facilitated transport.
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