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Test Bank for Beckers World of the Cell: chapter 8a (10th Edition by Jeff Hardin)
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Test Bank for Beckers World of the Cell:chapter 8a (10th Edition by Jeff Hardin)
1) Of the following molecules, which would NOT be expected to be moved across a membrane
by simple diffusion?
A) oxygen
B) fatty acids
C) water
D) glucose
E) dimethylurea - ANSd
2) One mechanism by which ions are specifically transported into the cell is the
A) gated channel.
B) alternating conformation model.
C) carrier protein transport.
D) uniport transport model.
E) all of the above - ANSa
(ion channel = transmembrane proteins that allow rapid passage of specific ions)
(gated channel = the pore opens and closes in response to some stimulus)
3) In examining glucose transport into a cell, the immediate phosphorylation of glucose following
its entry into the cell
A) keeps the glucose from being transported back out of the cell.
B) allows the cell to maintain higher levels of glucose outside the cell.
C) puts glucose into a form for use in cellular respiration.
D) puts glucose into a form to be stored.
E) all of the above - ANSe
4) In bacteria, the porins have the unique ability to transport
A) all hydrophilic molecules.
B) hydrophilic molecules of a particular size.
C) all hydrophobic molecules.
, D) hydrophobic molecules of a particular size.
E) any molecule, regardless of properties or size. - ANSb
(porin molecules are not an alpha helix but a so callad beta barrel)
(beta barrel = a water-filled pore, which allows passage of varous hydrophilic solutes, the size is
limitited by the size of the pore)
5) In the kidney, the specialized transport proteins that allow for very rapid fluid movement into
or out of cells are known as
A) aquaporins.
B) porins.
C) ionophores.
D) anion exchange proteins.
E) osmosins. - ANSa
(aquaporins = facilitate the rapid movement of water molecules into or out of cell in specific
tissues that require this capability)
(c: ionophores = molecules which transport ions across a cell membrane, most bacteria?)
6) The movement of water through a membrane, from an area of high concentration to an area
of low
concentration, is known as
A) active transport.
B) facilitated transport.
C) passive transport.
D) osmosis.
E) photolysis. - ANSd
(osmosis = movment of water through a semipermeable membrane driven by difference in
solute concentration on two sides of the membrane)
7) Which of the following is/are TRUE with regard to water movement in osmosis?
A) hypotonic → hypertonic
B) hypertonic → hypotonic
C) isotonic → hypotonic
D) hypertonic → isotonic
E) both choices C and D - ANSa
(hypo = lower / less)
(hyper = greater / very high)
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