ST.1 Producing New Cells N5 (MO)

Question 1

What does the nucleus of a cell contain?

Answer 1

All the genetic information for an organism

Question 2

What is the genetic information in the nucleus called and organised into?

Answer 2

DNA, it is organised into chromosomes

Question 3

What is mitosis and what controls it?

Answer 3

The nucleus controls mitosis, mitosis is the process of DNA copying itself

Question 4

What is the process of mitosis

Answer 4

• Chromosomes replicating to become thicker visible pairs of chromatids
• The chromosomes then line up along the equator and their chromatids are pulled apart by spindle fibres to opposite poles
• Two new nuclei form
• After mitosis the cell cytoplasm becomes pinched off and two genetically identical daughter cells are formed

Question 5

What does mitosis provide?

Answer 5

Provides new cells for growth and repair of damaged cells and maintains the diploid chromosome complement

Question 6

What do stem cells in animals do?

Answer 6

Stem cells in animals are unspecialised cells which can divide for repair of damaged cells

Question 7

What do stem cell have the potential for?

Answer 7

The potential to become different types of cells

Question 8

What do specialisation of cells in multicellular organisms lead to?

Answer 8

It leads to the formation of a variety of cells, tissues and organs

Question 9

What do groups of organs do?

Answer 9

Work together and form systems