Lipid Class Test

Which of the following is false about lipids?

• They are either strongly hydrophobic or amphipathic

• They are more soluble in water

• Extraction of lipids from tissues require organic solvents

• They are insoluble in water

Phospholipid contains

• hydrophilic heads and hydrophobic tails

• long water-soluble carbon chains

• positively charged functional groups

Palmitate has 16 carbon atoms with

• 2 double bonds

• 3 double bonds

• 3 double bonds

• None of these

The number of water molecules consumed by the formation of phosphatidyl serine are

• 0

• 1

• 2

• 4

VLDLs are synthesized in

• blood

• Liver

• Spleen

• Pancreas

Phospholipids are molecules that contain:

• positively charged functional groups.

• long water-soluble carbon chains.

• cholesterol.

• hydrophilic heads and hydrophobic tails.

Micelles of fatty acids in water are organized such that the ___ face the solvent and the ___ are directed toward the interior.

• hydrophilic heads; hydrophobic tails

• carboxylic acid groups; hydrocarbon chains

• All of these

The glycerophospholipids are composed of two fatty acids attached to glycerol and one of the following head groups:

• ethanolamine.

• Choline

• Serine

• All

The melting properties of fatty acids and lipid bilayers is due primarily to

• hydrogen bonds.

• the hydrophobic effect.

• van der Waals forces.

• electrostatic interactions.

What are the functions of dietary fat?

• Provide energy to the body

• Form part of cellular membranes

• Cell signalling

• All are these