True False Phospholipids are constantly diffusing from one membrane leaflet to t

Question

True False  Phospholipids are constantly diffusing from one membrane leaflet to the other, which helps create membrane asymmetry.
True False  C16:1 palmitoleic acid will have a lower melting point that C16:0 palmitic acid.
True False  Triacylglycerols have three ester-linked fatty acyl chains.
True False  Myristoyl, palmitoyl, and farnesyl groups anchor proteins to the cytoplasmic face of membranes, whereas a C-terminally attached glycolipid anchors proteins in the extracytoplasmic face of membranes.
True False  Of the phosphoglycerides phosphatidylserine, phosphatidylcholine, and phosphatidylethanolamine, only phosphatidylserine will have a netnegative charge at neutral pH.
True False  The steroid nucleus is made from five carbon units that each contain one carbon-carbon double bond and one side-branching methyl group.
True False  On a gram-for-gram basis, fatty acids and carbohydrates such as glucose yield approximately the same amount of energy when they are completely oxidized.
True False  Escherichia coli cells grown at 40°C would be expected to have a lower percentage of unsaturated fatty acids in their membranes than cells grown at 20°C.

Explanation / Answer

Phospholipids are constantly diffusing from one membrane leaflet to the other, which helps create membrane asymmetry - False

C16:1 palmitoleic acid will have a lower melting point that C16:0 palmitic acid. - True

Triacylglycerols have three ester-linked fatty acyl chains - False

Myristoyl, palmitoyl, and farnesyl groups anchor proteins to the cytoplasmic face of membranes, whereas a C-terminally attached glycolipid anchors proteins in the extracytoplasmic face of membranes - False

Of the phosphoglycerides phosphatidylserine, phosphatidylcholine, and phosphatidylethanolamine, only phosphatidylserine will have a netnegative charge at neutral pH - True

The steroid nucleus is made from five carbon units that each contain one carbon-carbon double bond and one side-branching methyl group - True

On a gram-for-gram basis, fatty acids and carbohydrates such as glucose yield approximately the same amount of energy when they are completely oxidized - False

Escherichia coli cells grown at 40°C would be expected to have a lower percentage of unsaturated fatty acids in their membranes than cells grown at 20°C - True

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