Biomolecule Flashcards
Commercially glucose is prepared by
Hydrolysis of starch in presence of dil H2SO4 under pressure and temp of 393K
The presence of 6 c atoms in glucose was confirmed by
Reaction with HI
How was the presence of carbonyl grp confirmed in glucose
Reaction with hydroxyl amine and hydrogen Cyanide it formed oxime and cyanohydrin
How was the presence of aldehyde grpmconfirmed in glucose
Rn with mild oxidizing agent like Br water yield gluconic acid
The presence of 5 OH grp was confirmed by
Rn with Acetic anhydride
The presence of 1° alcoholic grp was confirmed by
Oxidation of glucose and gluconic acid in presence of nitric acid yield saccharic acid
In carbohydrates D and L configuration is with resp to
Glyceraldehyde
Despite having aldehyde grp which of the following is not given by aldehydes
Schiffs test and reaction with hydrogen sulphite addition compound, pentacetate of glucose does not react with hydroxylamine
How is Alpha form of glucose obtained by
Crystallization from concentrated solution of glucose at 303K
How is beta form of glucose obtained
Crystallization from hot and saturated aq solution at 371K
Which has high melting point beta glucose or alpha glucose
Beta glucose
What is glycosididc linkage
Linkage btw two Monosacchrides through oxygen atom after the loss of water
In Sucrose Glycosidic linkage is btw
C1 of alpha (D) glucose and C2 of beta ( D) fructose
In maltose glycosidic linkage is btw
C1 of one glucose and C4 of another glucose ( Both are alpha D glucose)
In Lactose glycosidic linkage is btw
C1 of beta ( D) galactose and C4 of beta ( D) glucose
Starch is a polymer of
Alpha glucose
In amylose the linkage is
C1 and C4
In amylopectin the linkage is
C1 and C4 for unbranched and C1 and C6 for branched
Cellulose is made up of
Beta D glucose
Why is glycogen known as animal Starch?
The structure of glycogen is similar to Starch but glycogen is more branched
Hydrolysis of proteins obtain
Alpha Amino acids
A: glycine has sweet taste
R: tyrosine was first obtained from cheese
Both A and R are true but they are not related to each other
Essential amino acids
PVT TIM HALL
Phenylphalanine , valine , Tryptophan, threonine , isoleucine , Methionine, histidine, Arginine, lucine , Lysine
Amino acids bhave like
Salts
Most naturally occurring Amino acids have
L form
What is Peptide linkage ?
Peptide linkage is an amide linkage formed by cooh and nh2 grp of Amino acids
Insulin contains
51 Amino acids
Fibrous proteins are
Insoluble in water ( eg keratin and myosin )
Globular proteins are
Soluble in water
What is denaturation ?
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
Almost all enzymes are
Globular proteins
The b vitamin which can be stored in our body is
Vit B12
