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Bio 110 Final: Chapter 5
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Questions in this quiz (10)
1Which of the following statements best describes the chemical composition of biological membranes?
- ABiological membranes are bilayers of proteins with associated lipids and carbohydrates
- BBiological membranes are composed of two layers-- one layer of phospholipids and one layer of proteins
- CBiological membranes are bilayers of phospholipids with associated proteins and carbohydrates
- DBiological membranes are composed of equal numbers of phospholipids, proteins, and carbohydrates.
- EBiological membranes are composed of lipids with proteins attached to the outer surface.
2Which of the following events in a biological membrane can never be energetically favorable and therefore will not occur spontaneously ?
- AThe rotation of phospholipids
- Bthe lateral movement of phospholipids
- Cthe flip-flop of phospholipids to the opposite leaflet
- Dthe rotation of membrane proteins
- Ethe lateral movement of membrane proteins
3Let's suppose an insect, which doesn't maintain a constant body temperature, was exposed to a shit in temperature from 60 to 80 degrees F. Which of the following types of membrane changes would be the most beneficial to help this animal cope with the temperature shift?
- Aincrease the number of double bonds in the lipid tails of phospholipids
- Bincrease the length of the lipid tails of phospholipids
- Cdecrease the amount of cholesterol in the membrane
- Ddecrease the amount of carbohydrate attached to membrane proteins
- Edecrease the amount of carbohydrate attached to phospholipids
4Carbohydrates in the plasma membrane
- Aare bonded to a protein or lipid
- Bare located on the outer surface of the plasma membrane
- Ccan function as cell markers for recognition by other cells
- Dall of the above
- Ea and c only
5A transmembrane protein in the plasma membrane is glycosylated at two sites in the polypeptide sequence. Where in this protein would you expect these two site to be found?
- Ain the transmembrane segments
- Bin hydrophilic regions that project into the extracellular environment
- Cin hydrophilic regions that project into the cytosol
- Dcould be anywhere
- Eb and c only
6The tendency for Na+ to move into the cell can be due to
- Athe higher numbers of Na+ outside the cell, resulting in a chemical concentration gradient.
- Bthe net negative charge inside the cell attracting the positively charged Na+.
- Cthe attractive fore os K+ inside the cell pulling Na+ into the cell.
- DAll of the above
- Ea and b only.
7Let's suppose the solute concentration inside the cell of a plant is 0.3M and outside is 0.2M. If we assume the solutes do not readily cross the membrane, which of the following statements best describes what will happen?
- AThe plant cells will lose water, and the plant will wilt.
- BThe plant cells will lose water, which will result in a higher turgor pressure.
- CThe plant cells will take up a lot of water and undergo osmotic lysis.
- DThe plant cells will take up a little water and have a higher turgor pressure.
- EBoth a and b are correct.
8What features of a membrane are major contributors to its selective permeability?
- APhospholipid Bilayer
- BTransport Proteins
- CGlycolipids on the outer surface of the membrane
- DPeripheral membrane Proteins
- Eboth a and b
9What is the name given to the process in which solutes are moved across a membrane against their concentration gradient?
- Asimple diffusion
- Bfacilitated diffusion
- Cosmosis
- Dpassive diffusion
- Eactive transport
10Large particles or large volumes of fluid can be brought into the cell by
- Afacilitated diffusion
- Bactive transport
- Cendocytosis
- Dexocytosis
- Eall of the above
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- User has deleted their subject information Quiz on Bio 110 Final: Chapter 5, created by Deleted user on 13/12/2017.
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