Saturated and Unsaturated Fat

Saturated and Unsaturated Fat - interacting with water...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Saturated and Unsaturated Fat Saturated fatty acids have no double bonds between carbons. Unsaturated fatty acids have at least one double bond. Each double bonds produces a "bend" in the molecule. Double bonds produce a bend in the fatty acid molecule (see diagram above). Molecules with many of these bends cannot be packed as closely together as straight molecules, so these fats are less dense. As a result, triglycerides composed of unsaturated fatty acids melt at lower temperatures than those with saturated fatty acids. For example, butter contains more saturated fat than corn oil, and is a solid at room temperature while corn oil is a liquid. Phospholipids Phospholipids have a structure like a triglyceride (see diagram above), but contain a phosphate group in place of the third fatty acid. The phosphate group is polar and therefore capable of
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: interacting with water molecules. Phospholipids spontaneously form a bilayer in a watery environment. They arrange themselves so that the polar heads are oriented toward the water and the fatty acid tails are oriented toward the inside of the bilayer (see the diagram below). In general, nonpolar molecules do not interact with polar molecules. This can be seen when oil (nonpolar) is mixed with water (polar). Polar molecules interact with other polar molecules and ions. For example table salt (ionic) dissolves in water (polar). The bilayer arrangement shown below enables the nonpolar fatty acid tails to remain together, avoiding the water. The polar phosphate groups are oriented toward the water. Membranes that surround cells and surround many of the structures within cells are primarily phospholipid bilayers ....
View Full Document

Page1 / 2

Saturated and Unsaturated Fat - interacting with water...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online