Module 1 Cytokinesis and Significance

Question 1

Cytoplasmic division or ___ - the constriction of cytoplasm into two separate cells.

This usually begins in ___ and continues through ___ and into ___.

Answer 1

Cytokinesis

anaphase
telophase
interphase

Question 2

During cytokinesis, the cytoplasm divides by a process called ___.

The ___ plays an important role in determining where and when this occurs.

Answer 2

cleavage

mitotic spindle

Question 3

Furrowing of the plasma membrane occurs in the plane of the ___, at right angles to the long axis of the mitotic spindle.

A ___ tends to form midway between asters originating from two centrosomes

Answer 3

metaphase plate

cleavage furrow

Question 4

Cleavage is accomplished by the contraction of a ring composed mainly of ___ also known as ___.

This assembles in early anaphase. This is what develops a force large enough to bend a fine glass needle inserted into a cell

Answer 4

actin filaments

contractile ring

Question 5

The force generated by the contractile ring is due to the muscle-like sliding of the ___ and ___ filaments.

This interaction pulls the plasma membrane down intoa furrow

Answer 5

actin
myosin

Question 6

Significance of Mitosis (7)

Answer 6

1. Helps the cell in maintaining proper size
2. Helps in the maintenance of an equilibrium in the amount of DNA and RNA in the cell
3. Provides the opportunity for the growth and development to organs and the body of the organisms
4. Replacement of old and dead cells
5. In certain organisms, it is involved in asexual reproduction
6. The gonads and the sex cells depend on mitosis for the increase in their number (before the cells undergo meiosis)
7. The cleavage of egg during embryogenesis and division of blastomeres both occur during mitosis

Question 7

1. Helps the cell in maintaining ___ ___
2. Helps in the maintenance of an ____ in the amount of DNA and RNA in the cell
3. Provides the opportunity for the growth and development to ___ and ___ of the organisms
4. ___ of old and dead cells
5. In certain organisms, it is involved in ___
6. The ___ and ___depend on mitosis for the increase in their number (before the cells undergo meiosis)
7. The ___ of egg during embryogenesis and division of blastomeres both occur during mitosis

Answer 7

1. proper size
2. equilibrium
3. organs and body
4. Replacement
5. asexual reproduction
6. gonads and sex cells
7. cleavage