α-D-glucose and β D-glucose have a specific rotation of +112° and +19° respectively. In aqueous solution the rotation becomes +52°. This process is called:

  • inversion

  • racemisation

  • mutarotation

  • enolisation

The incorrect statement among the following is -
  • Insulin maintains sugar level in the blood of a human body.
  • Ovalbumin is a simple food reserve in egg white.
  • Blood proteins thrombin and fibrinogen are involved in blood clotting.
  • Denaturation makes the proteins more active.

The central dogma of molecular genetics states that the genetic information flows from

 
  • amino acids → proteins → DNA

  • DNA → carbohydrates → proteins

  • DNA → RNA → proteins

  • DNA → RNA → carbohydrates

The correct corresponding order of names of four aldoses with configuration given below

respectively, is
  • L-erythrose, L-threose, L-erythrose, D-threose

  • D-threose, D-erythrose, L-threose, L-erythrose

  • L-erythrose, L-threose, D-erythrose, D-threose

  • D-erythrose, D-threose, L-erythrose, L-threose

In a protein molecule, various amino acids are linked together by

  • b-glycosidic bond

  • peptide bond

  • dative bond

  • a-glycosidic bond

The correct statement regarding RNA and DNA, respectively is : 

 

  • The sugar component in RNA is ribose and the sugar component in DNA is 2'- deoxyribose.

  • The sugar component in RNA is arabinose and the sugar component in DNA is ribose.

  • The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose.

  • The sugar component in RNA is arabinose and the sugar component in DNA is 2'- deoxyribose.

D-(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the

oxime would be:-

Which of the following hormones is produced under the condition of stress which

stimulates glycogenolysis in the liver of human beings?

  • Thyroxin               

  • Insulin

  • Adrenaline             

  • Estradiol

Deficiency of vitamin B1 causes the disease

 

 

  • convulsions

  • beri-beri

  • cheilosis

  • sterility

Which one of the following sets of monosaccharides forms sucrose?

  •  a-D-galactopyranose and a-D-glucopyranose

  •  α-D-glucopyranose and   b-D-fructofuranose

  •  b-D -glucopyranose and a-D fructofuranose

  •  α-D-glucopyranose and  b-D-fructopyranose

Which one of the following statements is not true regarding (+) lactose?

molecule of D(+) galactose

  • (+) lactose is a β-glycoside formed by the union of a molecule of D(+) glucose and a

  • (+) lactose is a reducing sugar and does not exhibit mutarotation

  • (+) lactose, C12H22O11 contains 8-OH groups

  • On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose

In DNA, the complementary bases are:-

  • Adenine and thymine; guanine and cytosine

  • Adenine and thymine; guanine and uracil

  • Adenine and guanine; thymine and cytosine

  • Uracil and adenine; cytosine and guanine

Which one of the following vitamins is water-soluble?

  • Vitamin-B

  • Vitamin-E

  • Vitamin-K

  • Vitamin-A

RNA and DNA are chiral molecules, their chirality is due to :-

  • L-sugar component

  • chiral bases

  • chiral phosphate ester units

  • D-sugar component

Which one of the following compounds show the presence of intramolecular hydrogen bond?

  •   H2O2

  •   HCN

  •   Cellulose

  •   Concentrated acetic acid

In humans, the main oxygen carrier in the blood is -

  • Hemocyanin

  • Proteins

  •  Hemoglobin

  • Both microorganisms and haemoglobin.

The difference between amylose and amylopectin is : 

  • Amylopectin have 1→4 α - linkage and 1→6 α - linkage.

  • Amylose have 1→4 α- linkage and 1→6 β - linkage.

  •  Amylopectin have 1→4 α - linkage and 1→6 β - linkage.

  • Amylose is made up of glucose and galactose.

The correct corresponding order of names of four aldoses with configuration given below respectively, is

 

  •   L-erythrose, L-threose, L-erythrose, D-threose

  •   D-threose, D-erythrose, L-threose, L-erythrose

  •   L-erythrose, L-threose, D-erythrose, D-threose

  •   D-erythrose, D-threose, L-erythrose, L-threose

A compounds that can form a zwitterion is -
  • Aniline
  • Acetanilide
  • Benzoic acid
  • Glycine
Amino acids are linked together in protein by :
 

 
  •  β-glycosidic bond.
  • Peptide bond.
  • Dative bond.
  •  α-glycosidic bond.
A non-reducing sugar among the following is -
 

 

D(+) glucose yield an oxime with hydroxyl amine . The structure of the oxime would be:

Which one of the following does not exhibit the phenomenon of mutarotation?
In DNA, the complementary bases are : 

Cellulose is a straight-chain polysaccharide composed of only :

α-D (+) glucose and β-D (+) glucose are :

An insoluble biomolecule in water is -

The biomolecule that contain non-transitional metal ion is: 

The human body does not produce : 

Insulin regulates the metabolism of : 
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