R34.50

Resource Description

Detailed slide shows with notes and visuals on the grade 12 CAPS curriculum for the structure, function, location and history of DNA

Consists of:

* 38 slide presentation in full colour containing all information required by CAPS ATP (2021 – 2023)

* PDF and PP printer-friendly versions to use for student handouts

 

Detailed explanation of content:

  • Revision of the structure of the cell with an emphasis on the ribosome, cytoplasm and the parts of the nucleus
  • Two types of nucleic acids: DNA and RNA
  • Nucleic acids consist of nucleotides
  • Location of DNA
  • Makes up the genes on chromosomes (nuclear DNA)
  • Present in mitochondria (mitochondrial DNA)
  • Present in chloroplasts (plants)
  • Brief history of the discovery of the DNA molecule (Watson & Crick, Franklin & Wilkins)
  • Structure of DNA
  • The natural shape of the DNA molecule is a double helix
  • Each strand of the helix is made up of a sequence of DNA nucleotides
  • Three components of a DNA nucleotide:
  • Nitrogenous bases linked by weak hydrogen bonds:
  • Four nitrogenous bases of DNA: adenine (A), thymine (T), cytosine (C), guanine (G)
  • Pairing of bases in DNA occur as follows: A: T and G: C
  • Sugar portion (deoxyribose in DNA)
  • Phosphate portion
  • Stick diagram of DNA molecule to illustrate its structure
  • Functions of DNA:
  • Sections of DNA-forming genes carry hereditary information
  • DNA contains coded information for protein synthesis

 

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