Grade 12 CAPS DNA
R34.50
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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