Fat Synthesis Etc

Question 1

What is fat?

Answer 1

Fat is a long-chain hydrocarbon containing carboxylic acid moiety at one end

Question 2

Most naturally occurring fat exist in ………. With ……… Being the most common

Answer 2

C4-C22
C18 is the most common

Question 3

How do the following affect the melting point of fat?
Number of carbons
Degree of unsaturation

Answer 3

The higher the number of carbons the higher the melting point.
The higher the point of unsaturation,the lesser

Question 4

Saturated Fat with less than 8 no of carbon is ……….. at room temp while >10 is

Answer 4

Liquid
Solid

Question 5

Most naturally occurring unsaturated fatty acid exists in

Answer 5

Cis form

Question 6

Trans fat is found in

Answer 6

Food
Hydrogenation of unsaturated FA

Question 7

Essential fatty acids with the site of unsaturation beyond carbon ….. and …… cannot be synthesised in the body
List

Answer 7

9 and 10
Linoleic18: 9,12
Linolenic 18:9,12,15
Arachidonic20: 5,811,14
Eicosapentaenoic ( EPA) 20: 5,8,11,1417
Docosahexaenoic acid ( DHA) 22:
6 sites of unsaturation starting from 4

Question 8

Most common fatty acids are

Answer 8

C16 and C18

Question 9

Citrate shuttle is made up of

Answer 9

Tricarboxylate translocase system

Question 10

The enzymes for elongation are called ?

Answer 10

Elongases ( thiolase)

Question 11

Elongation takes place in ………..

Answer 11

Mitochondria and Endoplasmic reticulum

Question 12

Elongases prefer fatty acids of ………… Carbons

Answer 12

16 carbons or less

Question 13

The major substrate of elongation is ……….

Answer 13

Stearoyl Co A

Question 14

Desaturation occurs where?

Answer 14

Endoplasmic reticulum

Question 15

Desaturases uses oxygen as ……..

Answer 15

Electron acceptor

Question 16

Desaturases introduce double bonds at positons

Answer 16

9,6,5

Question 17

The two common naturally occurring fatty acids are

Answer 17

Palmitoleic 16:1d9
Oleic 18:1d9

Question 18

Animals cannot synthesize linoleate or linolenate fatty acids because?

Answer 18

They lack desaturases that can introduce a double bond beyond carbon 9

Question 19

Mammals can synthesize arachidonic acid but plants cannot T/F

Answer 19

True

Question 20

Arachidonic acid is a precursor for group of enzymes called

Answer 20

Eicosanoids