True or false? FalseOn a gram-for-gram basis, fatty acids and carbohydrates such

Question

True or false? FalseOn a gram-for-gram basis, fatty acids and carbohydrates such as glucose yield approximately the same amount of energy when they are completely oxidized TrueThe close packing of the tails of the lipids in a membrane is favored by electrostatic interactions between the acyl chains. True In active transport, the transported species moves across the membrane against a concentration gradient. FalseTriacylglycerols have three ester-linked phosphoryl groups that can in turn be ester-linked to serine, choline, ethanolamine, or inositol. FalseTransport 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 True 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

Ans:

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.

Explanation:

- Gram for grams, fats provide more energy than carbohydrates.

Ans:

The close packing of the tails of the lipids in a membrane is favoured by electrostatic interactions between the acyl chains: False.

Explanation:

- Van der Waals forces are the non covalent forces that favours close packing of the tails of the lipids in the membrane.

Ans:

In active transport, the transported species moves across the membrane against a concentration gradient: True.

Explanation:

- Active transport requires energy so that it can move substances against their concentration gradient.

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