BL1020 Ch 5 Exam Latest
Update
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.
Update
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.
