Biology: Cell division

• What is a gene?


  A short section of DNA controlling characteristics
• What is a chromosome?


  A long strand of coiled up DNA (23 pairs in human body, one from each parent)
• What is a nucleus?


  Where genetic information is found
• What is DNA?


  Unique chemical molecule
• What are the 4 bases?


  Adenine, Thymine, Guanine, Cytosine
• Why is cell division required?

  • For growth
  • Replace worn out cells
  • Repair damaged tissues
• What is a single-celled eukaryote called?

  Protozoa
• How many pairs of chromosomes do you have?


  23 pairs (one from each parent)
• What is a cell with two copies of DNA?


  A diploid
• How long is DNA in any one of your cells?


  2 meters long
• What are alleles?


  Different versions of the same gene
• In mitosis how do the chromosomes line up?


  They line up in the middle in terms of size