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Test Bank for Beckers World of the Cell: chapter 7a (10th Edition by Jeff Hardin)
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Test Bank for Beckers World of the Cell:chapter 7a (10th Edition by Jeff Hardin)
1) Which of the following is NOT a function of membranes?
A) define cell boundaries
B) compartmentalization
C) information storage
D) regulation of transport
E) cell-cell communication - ANSc
(information storage is a function of nucleus)
2) Which is NOT a model for membrane structure?
A) Overton lipid coat
B) Langmuir monolayer
C) Gorter and Grendel bilayer
D) Singer and Nicholson fluid mosaic
E) Watson and Crick double helix - ANSe
(Watson and Crick discovered the DNA double helix structure)
3) Temperature has a dramatic effect upon cell membranes. This influence can readily make a
cell membrane more solid or more fluid in response to the temperature. This is an example of
A) liquidation.
B) membrane flexibility.
C) phase transition.
D) membrane asymmetry.
E) scanning calorimetry. - ANSc
(phase transition = change in the state of a membrande between a fluid state and a gel state)
4) Two cells with different cell-surface markers are fused in the presence of polyethylene glycol
(PEG). The cells are then placed at 0°C. What do you expect to observe about the individual
cell markers?
A) The markers will evenly disperse throughout both membranes.
B) Only one marker will disperse while the other remains stationary.
, C) Both sets of markers will not mix, but will migrate to opposite poles from one another.
D) The markers will essentially remain where they are, with little migration.
E) The markers will be endocytosed by the fused cell and then redistributed as fused markers. -
ANSd
(because ist is to cold)
5) Which of the following molecules would NOT readily cross an intact cell membrane by simple
diffusion?
A) water
B) glucose
C) oxygen
D) fatty acids
E) ethanol - ANSb
6) With regard to the semipermeable nature of the plasma membrane, which of the following
would readily cross without the aid of a transport protein?
A) calcium ions
B) glucose
C) water
D) amino acids
E) DNA - ANSc
7) You are examining an electron micrograph of cells obtained from a new deep-sea life form.
Upon closer examination, you notice that there are two dark lines separated by a lightly stained
region. These results are similar to the observation of which person's or persons' investigation
into membrane structure?
A) Robertson
B) Gorter and Grendel
C) Unwin and Henderson
D) Overton
E) Singer and Nicolson - ANSa
(Robertson described the "unit membrane", each membrane appears as two dark lines
separated by a highly stained central zone ... that gives the appearance of "railroad track" in the
TEM)
(b: Gorter and Grendel = lipid bilayer 1925)
(c: Unwin and Henderson = transmembran segments)
(d: Overton = lipid nature of membrane 1890s)
(e: Singer and Nicolson = fluid mosaic model 1972)
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