A hydrocarbon is hydrophobic at all times. only in the living cell environment.
ID: 162603 • Letter: A
Question
A hydrocarbon is hydrophobic at all times. only in the living cell environment. except when it has an attached ionized functional group. in carbohydrates but not in lipids. A lipid is a polymer made up of which kind of monomers? glucose or modified glucose molecules amino acids nucleotides alternating sugar and phosphate groups fatty acids and glycerol Which Figure is of an unsaturated fat? Figure A Figure B A phospholipid molecule has a head and two tails. the tails are found at the surface of the membrane in the interior of the membrane spanning the membrane where the environment is hydrophilic both a and b are correct Which of the following is NOT a phosphoglyceride? cholesterol phosphatidylserine phosphotidyllethanolamine a and d are correct Proteins in a membrane are: peripheral if they are on the inside surface held in place by the cytoskeleton integral if they are embedded m the membrane and protrude from both surfaces of the bilayer integral if they protrude from onlyExplanation / Answer
6. A. At all times.
The covalent bonds between the Carbon and Hydrogen atoms are nonpolar covalent bonds. With nonpolar covalent bonds, unlike polar covalent bonds, there is an equal sharing of electron between the Carbon atoms and the Hydrogen atoms. Thus, there is no charge separation in the molecule and it cannot form hydrogen bonds with water.
Hydrocarbons do not mix with water because the dispersive interactive forces between hydrocarbon molecules themselves and the polar forces between water molecules themselves are very much greater than the dispersive forces between a water molecule and a hydrocarbon molecule.
7. E. Fatty acids and glycerol.
Lipids are made up from glycerol which links one to three fatty acids.
8. Figure A.
It carries double bond at one or more places, hence it is an unsaturated fatty acid chain.
9. B. In the interior of membrane.
In membranes, polar heads of phoepholipid molecules lie on outer and inner surface of membrane while as non polar tails lie inside .
10. E. A and d are correct.
These compounds do not contain phospahte group and hence are not phosphoglycerides.
11. C. Integral if they protrude only from one surface of lipid bilayer.
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