Lipids

Question 1

what are the two groups of lipids

Answer 1

• Triglyceride

- phospholipids

Question 2

what does a triglyceride consist of (what is its structure)

Answer 2

• 3 fatty acids (RCOOH)

- Glycerol

Question 3

what reaction is a triglyceride formed from

Answer 3

condensation reaction

Question 4

what bond is formed during the condensation reaction of a glycerol and a fatty acid

Answer 4

ester bond

Question 5

how is an ester bond formed

Answer 5

by a condensation reaction between the glycerol and fatty acid

Question 6

what can the R group in a fatty acid be ( x or y answer)

Answer 6

• SATURATED
  OR
• UNSATURATED

Question 7

what does a phospholipid consist of (what is its structure)

Answer 7

• 2 fatty acids
• glycerol
• phosphate group

Question 8

what is ONE difference that phospholipid has in comparison to the triglyceride.

Answer 8

phospholipid has a phosphate group

triglyceride does not.

Question 9

what is the properties in relation to its structure in a triglyceride

Answer 9

• it hs a hight ration of c-h bonded to carbons meaning MORE ENERGY IS RELEASED THAN THE SAME MASS OF CARBOHYDRATES.
• it is insoluble in water so it does not affect water potential

Question 10

what is the properties in relation to its structure in phospholipids

Answer 10

• it forms a bilayer which is used for the DIFFUSION of small/non polar molecules
• hydrophobic head- the phosphate attracts water NON POLAR
• hydrophobic tail- repels polar molecules.

Question 11

what is a saturated fatty acid

Answer 11

when there is no double bonds bonded to the c-h bond

Question 12

what is an unsaturated fatty acid?

Answer 12

when there is one or more double bonds in a C-H bonds

Question 13

how do you test for lipids

Answer 13

emulsion test

Question 14

in points state the method for the test for lipids

Answer 14

add ethanol to the test tube and shake

then add water

Question 15

what result will you see if lipid is present

Answer 15

white/ cloudy emulsion