Role of Lipids

Question 1

Fat contains 77% carbon, 12% hydrogen and 11 percent of?

Answer 1

oxygen

Question 2

one gram of fat after complete oxidation produces?

Answer 2

9.3 kcal heat

Question 3

Three fatty acid are considered to be essential for farm animals, except?

oleic, linoleic, linolenic, arachidonic acids

Answer 3

oleic acid

Question 4

defined as the milligrams of potassium hydroxide required to saponify 1 gram of fat

Answer 4

saponification number

Question 5

defined as the milligram of KOH required to
combine with the acetic acid liberated by the saponification of one gram of acetylated fat

Answer 5

acetyl number

Question 6

the milligrams of KOH required to neutralize the free fatty acids present in 1 gram of fat

Answer 6

acid number

Question 7

defined as the number of me. of decinormal
alkali required to neutralize the steam volatile fatty acid from 5 g of fat

Answer 7

Reichert- Meissl number (R.M. Value)

Question 8

number of milliliters of 0.1 N KOH required to neutralize the insoluble fatty acids obtained from 5 gram of fat

Answer 8

polenske number

Question 9

caused by the micro-organism in the fat in which short chain fatty acids are hydrolysed into malodourous fatty acids

Answer 9

hydrolytic rancidity

Question 10

They are defined as the esters of higher fatty acids and of higher monohydroxy alcohol. They are found in numerous reactions in plants, animals and microorganism where they form a protective covering and are present in oily secretion.

Answer 10

waxes

Question 11

This insect wax is a complex mixture of ester, some fatty acids, alcohols and hydroxarbons. It contains mainly the myricyl palmitate as the ester.

Answer 11

beeswax

Question 12

material forms a protective coating over the wool fibres and is a wax rather than fat

Answer 12

lanolin or wool fat

Question 13

If lecithin has a nitrogenous base of choline, cephalin has?

Answer 13

ethanolamine

Question 14

Lecithin has choline;
Cephalin has ethanolamine; and
Phosphatidyl serine has what nitrogenous base?

Answer 14

serine

Question 15

These compounds are found in nervous tissue and differ from phosphoglycerides in the nature of nitrogenous base components and lack of glycerol.

Answer 15

Phosphosphinosides (sphingomyelins)

Question 16

These compounds on hydrolysis yield glycerol, fatty acid, inositol and phosphate.

Answer 16

phosphoinositide

Question 17

what compounds occur most commonly in nerve tissues?

Answer 17

glycolipids

Question 18

these are lipids which on hydrolysis give the products of simple and compound lipids and additional other compounds such as steroids, fatty aldehydes, ketones, alcohols, essential oils and hydrocarbons

Answer 18

derived lipids

Question 19

a derived lipid which include such biologically important compounds as the sterols, the
bile acids, the adrenal hormones and sex hormones

Answer 19

steroids

Question 20

Sterols are classified into three groups based on origin. If phytosterol is from plants, zoosterols are from animals, mycosterol is from?

Answer 20

fungi

Question 21

It is a phytosterol widely distributed in brown algae, bacteria and higher plants. It is important as the precursor of ergocalciferol or vitamin D2

Answer 21

Ergosterol

Question 22

important in the duodenum where they aid the emulsification of fats and the activation of lipase

Answer 22

bile acid

Question 23

These include male sex hormone (androgens), and female sex hormones (estrogen and progesterone) as well as cortisol, aldosterone and corticosterone which are produced by the adrenal cortex.

Answer 23

steroid hormones

Question 24

found in plants have strong characteristic odours and flavours and are components of essential oils such as lemon or camphor oil

Answer 24

terpenes

Question 25

refers to the dispersion of lipids in small droplets

Answer 25

emulsification

Question 26

What are the two temporary compounds formed during lipid absorption?

Answer 26

micelles and chylomicrons

Question 27

What are the three processes lipids undergo in the rumen?

Answer 27

hydrolysis, biohydrogenation, and conjugated fatty acid formation