Biomolecule

Question 1

Commercially glucose is prepared by

Answer 1

Hydrolysis of starch in presence of dil H2SO4 under pressure and temp of 393K

Question 2

The presence of 6 c atoms in glucose was confirmed by

Answer 2

Reaction with HI

Question 3

How was the presence of carbonyl grp confirmed in glucose

Answer 3

Reaction with hydroxyl amine and hydrogen Cyanide it formed oxime and cyanohydrin

Question 4

How was the presence of aldehyde grpmconfirmed in glucose

Answer 4

Rn with mild oxidizing agent like Br water yield gluconic acid

Question 5

The presence of 5 OH grp was confirmed by

Answer 5

Rn with Acetic anhydride

Question 6

The presence of 1° alcoholic grp was confirmed by

Answer 6

Oxidation of glucose and gluconic acid in presence of nitric acid yield saccharic acid

Question 7

In carbohydrates D and L configuration is with resp to

Answer 7

Glyceraldehyde

Question 8

Despite having aldehyde grp which of the following is not given by aldehydes

Answer 8

Schiffs test and reaction with hydrogen sulphite addition compound, pentacetate of glucose does not react with hydroxylamine

Question 9

How is Alpha form of glucose obtained by

Answer 9

Crystallization from concentrated solution of glucose at 303K

Question 10

How is beta form of glucose obtained

Answer 10

Crystallization from hot and saturated aq solution at 371K

Question 11

Which has high melting point beta glucose or alpha glucose

Answer 11

Beta glucose

Question 12

What is glycosididc linkage

Answer 12

Linkage btw two Monosacchrides through oxygen atom after the loss of water

Question 13

In Sucrose Glycosidic linkage is btw

Answer 13

C1 of alpha (D) glucose and C2 of beta ( D) fructose

Question 14

In maltose glycosidic linkage is btw

Answer 14

C1 of one glucose and C4 of another glucose ( Both are alpha D glucose)

Question 15

In Lactose glycosidic linkage is btw

Answer 15

C1 of beta ( D) galactose and C4 of beta ( D) glucose

Question 16

Starch is a polymer of

Answer 16

Alpha glucose

Question 17

In amylose the linkage is

Answer 17

C1 and C4

Question 18

In amylopectin the linkage is

Answer 18

C1 and C4 for unbranched and C1 and C6 for branched

Question 19

Cellulose is made up of

Answer 19

Beta D glucose

Question 20

Why is glycogen known as animal Starch?

Answer 20

The structure of glycogen is similar to Starch but glycogen is more branched

Question 21

Hydrolysis of proteins obtain

Answer 21

Alpha Amino acids

Question 22

A: glycine has sweet taste
R: tyrosine was first obtained from cheese

Answer 22

Both A and R are true but they are not related to each other

Question 23

Essential amino acids

Answer 23

PVT TIM HALL
Phenylphalanine , valine , Tryptophan, threonine , isoleucine , Methionine, histidine, Arginine, lucine , Lysine

Question 24

Amino acids bhave like

Answer 24

Salts

Question 25

Most naturally occurring Amino acids have

Answer 25

L form

Question 26

What is Peptide linkage ?

Answer 26

Peptide linkage is an amide linkage formed by cooh and nh2 grp of Amino acids

Question 27

Insulin contains

Answer 27

51 Amino acids

Question 28

Fibrous proteins are

Answer 28

Insoluble in water ( eg keratin and myosin )

Question 29

Globular proteins are

Answer 29

Soluble in water

Question 30

What is denaturation ?

Answer 30

A protein in its unique 3 dimensional geometry and biological activity is called a native protein . When subjected to a change in temp and pH the hydrogen bonds are disturbed . Thus the globules unfold and the helix get uncoiled and protein loses its biological activity

Question 31

Almost all enzymes are

Answer 31

Globular proteins

Question 32

The b vitamin which can be stored in our body is

Answer 32

Vit B12