The amino acid, trytophan is the precussor for the synthesis of
thyroxine and tri-iodothryonine
estrogen and progesterone
cortisol and cortisone
cortisol and cortisone
D.
cortisol and cortisone
Melatonin and serotonin are derivatives of tryptophan amino acid.
Water-soluble pigments found in plant cell vacuoles are
chlorophylls
carotenoids
anthocyanins
anthocyanins
A complex of ribosomes attached to a single strand of RNA is known as
Polymer
Polypeptide
Okazaki's fragment
Okazaki's fragment
One of the major components of cell wall of most fungi is
peptidoglycan
cellulose
hemicellulose
hemicellulose
A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. there is no formation of cell plate and thus the cell is containing more number of chromosomes as compares to other dividing cells. This would result in
polyploidy
somaclonal variation
polyteny
polyteny
Which of the following features is not present in the phylum-Arthropoda?
Metameric segmentation
Parapodia
Jointed appendages
Jointed appendages
A typical fat molecule is made up of
One glycerol and three fatty acid molecules
One glycerol and one fatty acid moleule
Thre glycerol and three fatty acid molecules
Thre glycerol and three fatty acid molecules
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?
C4
CAM
Nitogen-fixer
Nitogen-fixer
Which of the following features is not present in Periplaneta americana?
Indeterminate and radical cleavage during embryonic development
Exoskeleton composed of N-acetylglucosamine
Metamerically segmented body
Metamerically segmented body
