SAT II Biology M : Lipids
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Example Questions
Example Question #1 : Molecular Biology
Phospholipids are an essential component of the phospholipid bilayer necessary to the cell.
Which of the following correctly represents a phospholipid subunit with the corresponding polarity?
Phosphate head: nonpolar
Fatty acid tail: polar
Phosphate tail: polar
Fatty acid tail: nonpolar
Fatty acid head: nonpolar
Fatty acid tail: nonpolar
A phospholipid generally consists of a phosphate head (polar) and a fatty acid tail (non-polar).
Example Question #1 : Lipids
The phospholipid bilayer is critically important to the separation of the internal and external environment of the cell.
What drives the formation of the phospholipid bilayer?
The external environment pushes non-polar hydrophobic fatty acid tails to form the inner layer and the polar hydrophilic head groups to form the outer layer.
The external environment pushes non-polar hydrophobic fatty acid tails to form the inner layer and the polar hydrophobic head groups to form the outer layer.
The external environment pushes non-polar hydrophilic fatty acid tails to form the inner layer and the polar hydrophilic head groups to form the outer layer.
None of these
The external environment pushes non-polar hydrophilic fatty acid tails to form the inner layer and the polar hydrophobic head groups to form the outer layer.
The external environment pushes non-polar hydrophobic fatty acid tails to form the inner layer and the polar hydrophilic head groups to form the outer layer.
The external hydrophilic environment attracts polar hydrophilic phosphate head groups to the exterior, while allowing non-polar hydrophobic fatty acids to remain shielded in the interior of what becomes the phospholipid bilayer.
Example Question #12 : Molecular Biology
Lipids are made up of hydrocarbons linked to each other.
A hydrocarbon involves an atom of carbon with how many hydrogen atoms bonded to it?
Four
Five
One
Two
Three
Two
A hydrocarbon is made up of a carbon and two hydrogen atoms attached to it.
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