Producing New Cells Flashcards
Cell division is essential to allow……
Organisms to grow and repair by replacing damaged cells with new ones
examples of the importance of cell division to multicellular organisms
Multicellular organisms use cell division to grow
Multicellular organisms use cell division to repair damaged parts like cuts, broken bones
What are chromosomes
Chromosomes contain DNA - 46 chromosomes in body cell ,
23 in sex cells
Diploid cells have
2 matching sets of chromosomes
Haploid = 23 and diploid = 46
What are new cells produced by?
A form of cell division called mitosis
As a result of Mitosis what happens to the parent cell?
Parent cel produces 2 identical daughter cells by the division of the nucleus then cytoplasm
2 identical cells produced by cell division have….
The same number of chromosomes as the parent cell
Sequence of mitosis
- DNA replication occurs,
- Chromosomes become visible,
- Chromosomes line up at equator,
- Chromosomes pulled by spindle fibres
- Chromosomes at opposite poles of cells
- Cytoplasm divides
Cells can be grown in………..
Cultures using aseptic techniques
Producing cell cultures use techniques such as…
Disinfect the work top, vessels are open for the minimum amount of time, flame the neck of test tubes and McCartney bottles, keep kids on Petri dishes and bottles to limit exposure to air, sterilise all items before and after contact with micro organisms
Micro organisms need to be cultured in….
An appropriate medium such as nutrient broths and nutrient agars
Factors that need to be controlled when culturing cells
Oxygen,
Temperature,
pH
Fermenters can be used to culture microorganism in….
A controlled environment
Micro organisms grow by…..
Cell division