True or false? On a gram-for-gram basis, fatty acids and carbohydrates such as g

Question

True or 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. The close packing of the tails of the lipids in a membrane is favored by electrostatic interactions between the acyl chains In active transport, the transported species moves across the membrane against a concentration gradient Triacylglycerols have three ester-linked phosphoryl groups that can in turn be ester-linked to serine, choline, ethanolamine, or inositol. Transport proteins allow solute translocation across a membrane by providing a pore lined with water molecules that hydrate the solute and lubricate its passage through the membrane In an amphipathic alpha helix, non-polar amino acid side chains face one side of the helix, and polar uncharged side chains face the other side. The carbohydrate headgroups in glucosyl ceramide, lactosylceramide, and ganglioside are all attached to ceramide via a phosphoryl group Asymmetric distribution of phospholipids in the bilayers of cell membranes arises because phospatidylcholine and sphingomyelin spontaneously translocate from the cytoplasmic to the extracytoplasmic face of the membrane.

Explanation / Answer

1. False
Fats release more energy compared to carbohydrates

2. False
Close packing of lipid tails occurs by hydrophobic/Vanderwal interactions

3. True
Active transport can occur against the concentration gradient at expense of ATP.

4. True
Phosphatidylserine
Phosphatidylcholine
Phosphatidylethanolamine
Phosphatidylinositol

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