Chapter 5

Question 1

Lipids come in?

Answer 1

Wide variety of shapes and sizes

Question 2

What is the one thing all lipids have in common?

Answer 2

Water soluble

Question 3

Energy density of lipids?

Answer 3

One gram of fat = 9.45 kcals gross energy
One gram CHO = 4.2 kcals gross energy
Fat had 2.25 times more energy
Related to ratio of O:H in molecule

Question 4

What are the two types of lipids?

Answer 4

Saturated - single bonds
Solid at room temp

Unsaturated - double bonds
Liquid at room temperature

Some can be both

Question 5

Saturated fats

Answer 5

Fatty acids

Question 6

Triglycerides

Answer 6

Containing primarily unsaturated farty acids are liquid at room temperature (cooking oils)

Question 7

Chain lengths that are longer tend to be what at room temperature?

Answer 7

Solid

Question 8

Nutritional Functions of lipids

Answer 8

Source of energy carrier of absorption
EFA
Cell walls

Question 9

Source of energy

Answer 9

Oxidation of fat yields CO2 & H2O & Energy
2.25 times more energy than CHO
As far as cost, it can be cheap

Question 10

Carrier for absorption

Answer 10

Fat soluble vitamins from gut
In blood as lipoprotein complexes 
- cholesterol - hdl and ldl 
- sex hormones
- fat soluble vitamins

Question 11

Essential fatty acids

Answer 11

Linoleic (18 c, 2 double bonds)
Linolenic (18 c, 3 double bonds)
Arachidonic (20 c, 4 double bonds) - cannot be produced by animals, precursors of a number of unsaturated fatty acids

Question 12

What are all 3 EFA?

Answer 12

Are unsaturated and no requirement for saturated

Made by mco in rumen