National 5 Biology
Multicellular Organisms
1
Cell Division Questions
1. What is the name given to an organism’s total number of
chromosomes?
2. Why do cells need to divide in unicellular organisms?
3. Why do cells in multicellular organisms need to divide?
4. Why is it essential that the new cells produced by mitosis have exactly the
same number of chromosomes as the parent cells?
5. How many bacteria cells would be present at 3 hours if you started with one
cell and cell division takes 20 minutes? (look at slide 19 in the powerpoint
to help you with this one)
6. Complete the table with descriptions of each of the terms
Term
Description
Chromosome
Centromere
Spindle fibre
Equator (when talking about cells)
Unicellular organism
Multicellular organism
7. Complete the table below with a description of what is happening/ has
happened at each stage.
National 5 Biology
Multicellular Organisms
2