Major role of minor elements inside living organisms is to act as :
binder of cell structure
constituent of hormone
building blocks of important amino acids
cofactor of enzymes
D.
cofactor of enzymes
The micro-elements are required by plants in trace ammount (0.1 mg/gm dry matter). These are mostaly involved in the functioning of enzyme as co factors or metal activator.
First natural cytokinin was discovered by :
Skoog and Miller
Letham
Benson and Calvin
Thimann and Went
Cook cambium and vascular cambium are :
parts of secondary xylem and phloem
parts of pericycle
lateral meristems
apical meristems
Which of the following is not vestigial in man ?
Tail vertebrae
Nails
Nictitating membrane
Vermiform appendix
C4 plants, synthesis of sugars/final CO2 fixation occurs in:
palisade cells
spongy cells
undifferentiated mesophyll cells
bundle sheath cells
The number of hydrogen bonds between adenine and thymine in a DNA molecule is :
two
three
four
eight
A eukaryotic gene contains two kinds of base sequences. Which of these plays an important role in protein synthesis?
Introns
Exons
Both 'a' and 'b'
None of the above