Tag: cell division in embryo development

Quizzes (0) Questions (164)

Questions Related to cell division in embryo development

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

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 ............

  1. Fragmentation

  2. Binary fission

  3. Budding

  4. Spore formation
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

In animal cells, cytokinesis involves 

  1. Separation of sister chromatids

  2. Contraction of ring of microfilaments

  3. Depolymerisation of kinetochore microtubules

  4. Protein kinase that phosphorylates other enzymes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During cytokinesis in animal cells, a contractile ring composed of actin microfilaments and myosin forms beneath the plasma membrane. The constriction of this ring pinches the cell into two daughter cells.

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

In animal cytokinesis, cleavage occurs with the help of

  1. Microtubules

  2. Spindle fibres

  3. Microfibrils

  4. Microfilaments
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In animal cells, cytokinesis is achieved by the formation of a contractile ring composed of actin microfilaments, which pinches the cell membrane inward.

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

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 ?

  1. Cleavage furrow formation

  2. Attachment of kinetochore to spindle fibres

  3. Spindle fibre formation

  4. Cell elongation during anaphase
Reveal answer Fill a bubble to check yourself
C Correct answer
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.