Revision cell cycle

Choose the incorrect statement with reference to MITOSIS :

• Mitosis usually results in the production of diploid daughter cells with identical genetic complement

• Mitosis or the equational division is usually restricted to the Haploid cells only

• A very significant contribution of mitosis is cell repair.

• The growth of multicellular organisms is due to mitosis.

Telophase shows the following key events:

1 Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements.

2. Nuclear envelope develops around the chromosome clusters at each pole forming two daughter nuclei.

3. Centromeres split and Nucleolus, golgi complex and ER reform.

Identify the correct statements :

• 1 and 2 correct

• 1 and 3 correct

• 2 and 3 correct

• 1,2 and 3 correct

During Interphase :

• only cell grows

• cell grows and DNA replicates

• only organeles duplicates

• none pf the above

With respect to G1 mark the correct options:

• G1 phase corresponds to the interval between mitosis and termination of DNA replication.

• During G1 phase the cell is not metabolically active

• cell grows but does not replicate its DNA.

• Semiautonomous organelles doubles

In animal cells, during the S phase,

DNA replication begins in the ____, and the ____ duplicates in the cytoplasm.

• chromatin and centrosomes

• centrosomes and chromosomes

• Centrioles , nucleus

• nucleus , centrioles

Choose the correct option with respect to Go phase :

1. Heart cells in the adult animals do not appear to exhibit division

2. These Cells divide only occasionally

3. replace cells that have been lost because of injury

4. Cells in this stage remain metabolically active but proliferate unless called on to do so

• only 4

• 1,2 and 3

• 2 and 4

• 1 ,2 and 4

Since the number of chromosomes in the parent and progeny cells is the same, it is also called as _____

Fill in the blank

• Reductional division

• equational division

• cytokinesis

• karyokinesis

Identify the correct statements:

• The two asters together forms mitotic apparatus.

• In telophase stage, condensation of chromosomes is completed and they can be observed clearly under the microscope.

• In the S and G2 phases the new DNA molecules formed are not distinct but intertwined

• at the end of prophase, when viewed under the microscope, it show golgi complexes, endoplasmic reticulum

At the time of cytoplasmic division, organelles like mitochondria and plastids get distributed between the two daughter cells.

• True

• False

• Don't know

In some organisms karyokinesis is not followed by cytokinesis as a result of which multinucleate condition arises leading to the formation of ____

• syncarpous

• syngenesis

• syncitium

• Coenocyte