Spindle fibres of mitotic cell are made up of
tubulin
actin
myosin
collagen
A.
tubulin
Spindle fibres are formed during cell division. These are made up of tubulin. Each tubulin molecule is made up of a. and B sub-units. Tubulin molecules are attached heat to tail and form a strand and 13 strands aggregate to form a microtubule. These microtubules are attached to kinetochores of. metaphase chromosomes and play an important role in the movement of chromosomes during subsequent stages of cell division.
In synapsis two homologous chromosomes are connected at
centromeres
chromomeres
telomeres
none of these
Which of the followings does not occur in the interphase of eukaryotic cell division?
Increase of ATP synthesis
Increase of DNA synthesis
Increase of RNA synthesis
Reduction in cell size
Stages in proper sequence of prophase- I are
zygotene, leptotene, pachytene, diakinesis
leptotene, zygotene, pachytene, diplotene and diakinesis
eptotene, pachytene, zygotene, diakinesis and diplotene
diplotene, diakinesis, pachytene, zygotene and leptotene
In cell cycle, during, which phase chromosomes are arranged in equatorial plate ?
Metaphase
Anaphase
Telophase
Prophase
Match the item in column I with those in column II and the choose the correct answer.
| Column I | Column II |
| A. Mitosis | 1. Occurs in diploid cells only |
| B. Meiosis | 2. Occurs in both haploid and diploid cells |
| 3. Daughter and parent cells have same chromosome numbers | |
| 4. Synapsis of homologous chromosomes. |
A- 1; B- 2
A- 2; B- 3
A- 3; B- 4
A- 4; B- 1
During meiosis crossing over occurs between which part of homologous chromosome ?
Sister chromatids
Non-sister chromatids
Genes
Alleles
