cells mitosis etc

Question 1

what is the definition of mitosis

Answer 1

the type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus

Question 2

What are the three reasons why new cells are required?

Answer 2

Growth (we need more cells as we grow)

Development (we need new cell types as we develop new tissues)

Repair (we need to replace the cells that we lose each day)

Question 3

what are the stages of the cell cylce?

Answer 3

Cellular growth - the cell gets larger and produces more sub-cellular structures, such as mitochondria and ribosomes.
DNA replication - chromosomes duplicate, so that each consists of two arms (copies).
More cell growth.
Mitosis - the DNA divides in two.
Cytokinesis - the cell divides in two.

Question 4

what are the steps of mitosis?

Answer 4

DNA condenses to form chromosomes.
Chromosomes line up along the centre of the cells.
Cell fibres pull the two arms of each chromosome to opposite sides (poles) of the cell.
Cytokinesis - the entire cell divides to form two identical daughter cells.

Question 5

What is the respiration equation?

Answer 5

glucose + oxygen → carbon dioxide + water + energy released