True or false? True False The carbohydrate headgroups in glucosyl ceramide, lact

Question

True or false?

True False  The carbohydrate headgroups in glucosyl ceramide, lactosylceramide, and ganglioside are all attached to ceramide via a phosphoryl group.
True False  Triacylglycerols have three ester-linked phosphoryl groups that can in turn be ester-linked to serine, choline, ethanolamine, or inositol.
True False  Triacylglycerols are a better fuel reserve than carbohydrates because their fatty acyl chains are more reduced than carbohydrates such as glucose.
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.
True False  Membrane asymmetry is created because phospholipids are initially inserted in one leaflet of a bilayer and proteins that are postulated to act as "flippases" then selectively translocate some phospholipids and slowly translocate others.
True False  In active transport, the transported species moves across the membrane against a concentration gradient.

Explanation / Answer

1. False. The link is through one or more sialic acid groups.

2. True

3. True.

4. False. Membrane asymmetry is created because when proteins are synthesized by the pre-existing membranes, they are inserted asymmetrically into the new membranes. They do not have a specific pattern or template of insertion.

5. True. Active transport takes place with the assistance of enzymes, transport proteins and energy.

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