Tag: cell division in embryo development

Questions Related to cell division in embryo development

The method of reproduction in unicellular organisms like amoeba and bacteria in which they split into two equal halves and produce new ones is called ............

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Fragmentation

  2. Binary fission

  3. Budding

  4. Spore formation

Show answer
Correct Option: B
Explanation:

In binary fission, parent cell divides into two equal halves called daughter cells. Daughter cells are identical to each other and to their parent cell. Organisms like the amoeba, bacteria, euglena, etc. exhibit binary fission. During multiple fission, the organism divides itself into numerous daughter cells.

So, B is the correct option.

In animal cells, cytokinesis involves 

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Separation of sister chromatids

  2. Contraction of ring of microfilaments

  3. Depolymerisation of kinetochore microtubules

  4. Protein kinase that phosphorylates other enzymes

Show answer
Correct Option: A

In animal cytokinesis, cleavage occurs with the help of

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Microtubules

  2. Spindle fibres

  3. Microfibrils

  4. Microfilaments

Show answer
Correct Option: D

Cytochalasin B is a drug isolated from moulds. It blocks the formation of contractile microfilaments. Which of the following aspects of the cell cycle would be most disrupted due to this ?

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Cleavage furrow formation

  2. Attachment of kinetochore to spindle fibres

  3. Spindle fibre formation

  4. Cell elongation during anaphase

Show answer
Correct Option: C
Explanation:

Spindle formation is mainly done by centrioles. It helps in separation of chromosomes during cell division. Cytochalasin B is a cell-permeable mycotoxin. It inhibits cytoplasmic division by blocking the formation of contractile microfilaments due to which cell is unable to maintain the desired number of chromosomes and leads to numerical abberations.