The molecular structure of insulin was first described by :
Korenberg
Swaminathan
Richardson
Sanger
D.
Sanger
Insulin is a protein of 51 amino acids. It is a peptide hormone, made up of two polypeptide chains joined together by disulphide bridges. It is produced by the beta cells of the pancreatic islets. Sanger was the first person to complete the amino acid sequence of insulin.
Mutations which alter nucleotide sequence within a gene are :
frame shift mutations
base pair substitutions
both 'a' and 'b'
none of these
Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species ?
Pfr forms
Pr forms
Both forms
None of these
When a tall plant with rounded seeds (TTRR) is crossed with a dwarf plant with wrinkled seeds (ttrr), the F1 generation consists of tall plants with rounded seeds. How many types of gametes an F1 plant would produce ?
One
Three
Four
Eight
Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?
E. coli
Nostoc
Drosophila
Neurospora
Which of the following pair is characterised by swollen lips, thick pigmented skin of hands and legs and irritability ?
Iodine - Goitre
Protein - Kwashiorkor
Thiamine - Beri-beri
Nicotinamide- Pellagra
Insect resistance transgenic cotton has been produced by inserting a piece of DNA from:
an insect
a bacterium
a wild relative of cotton
a virus
