Which cell organelle is covered by only one unit membrane ?
Nucleus
Plastids
Mitochondria
Lysosome
The S-phase of cell cycle is characterized by:
duplication of chromosome
shotening of chromosome
duplication of DNA
duplicatin of centriole
C.
duplication of DNA
The cell cycle of eukaryotic cell is divided into following four phases.
(1) G1 phase (first growth phase)
(2) S phase (synthesis phase)
(3) G2- phase (second growth phase)
(4) M-phase (mitotic phase)
S-phase is the phase is cell cycle during which DNA is replicated.
Phytotron is :
a controlled condition chamber for tissue
leaf culture process
special culture of plants
root culture process
If centromere is the middle, the chromosome is called :
sub-metacentric
metacentric
acentric
telocentric
Which hormone is responsible for mobilization of storage food during seed germination ?
Auxin
Gibberellin
Cytokinin
Ethylene