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
C.
bivalent
Homologous chromosomes pair up. This process is called synapsis. Each pair is called bivalent. Chromosomes line up around the equator of the spindle, attached by their centromeres to the spindle fibres, which are microtubules. The microtubules forming spindles can be of two types, i.e., kinetochore-microtubule and non-kinetochore microtubule.
Axoneme is the central core of a cilium of flagellum consisting of a central pair of filaments surrounded by nine other pairs. The equatorial plate is the plane located midway between the poles of a dividing cell during the metaphase stage of mitosis or meiosis. It is formed from the migration of the chromosome to the centre of the spindle.
The cell -mediated immunity inside the human body is carried out by
T- lymphocytes
B - lymphocytes
thrombocytes
thrombocytes
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)
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