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
The molecular structure of insulin was first described by :
Korenberg
Swaminathan
Richardson
Sanger
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
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
Mutations which alter nucleotide sequence within a gene are :
frame shift mutations
base pair substitutions
both 'a' and 'b'
none of these
Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?
E. coli
Nostoc
Drosophila
Neurospora
D.
Neurospora
G.W. Beadle and E.L. Tatum demonstrated by the biochemical mutation experiment in Neurospora that genes express themselves through synthesis of enzymes. They proposed a concept called "one gene-one enzyme hypothesis".
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
Diadelphous stamens are the characteristic features of :
Ranunculaceae
Fabaceae
Poaceae
Malvaceae
Human immuno deficiency virus causes
Acquired immuno deficiency syndrome
Anthrax
Tuberculosis
Polio