Multiple Choice QuestionsMicrotubules are the constituent of
spindle fibres, centrioles and cilia
centrioles, spindle fibres and chromatin
centrosome, nucleosomes and centrioles
centrosome, nucleosomes and centrioles
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 is not a characteristic feature during mitosis in somatic cells?
Disappearance of nucleolus
Chromosome movement
Synapsis
Synapsis
Spindle fibres attach on to
kinetochore of the chromosome
centrosome of the chromosome
kinetosome of the chromosome
kinetosome of the chromosome
The complex formed by a pair of synapsed homologous chromosomes is called
equatorial plate
kinetochore
bivalent
bivalent
The cell -mediated immunity inside the human body is carried out by
T- lymphocytes
B - lymphocytes
thrombocytes
thrombocytes
A.
T- lymphocytes
T - lymphocyte receptors can recognise the only antigen that bound to cell membrane proteins these lymphocytes mediates CMI (cell-mediated immunity). B - lymphocytes are the major effector molecules of humoral immunity. Erythrocytes are red blood cells. Thrombocytes or platelets secrete factors that are involved in the vascular repair.
A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics
|
Telophase |
Nuclear envelope reforms, Golgi complex reforms |
|
Late anaphase |
Chromosomes move away from equatorial plate, Golgi complex not present |
|
Cytokinesis |
Cell plate formed, Mitochondria distributed between two daughter cells |
|
Cytokinesis |
Cell plate formed, Mitochondria distributed between two daughter cells |
Arrange the following events of meiosis in correct sequence:
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
(b), (a,) (d), (c)
(b), (a) (c), (d)
(a), (b) (c), (d)
(a), (b) (c), (d)
Switch
