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Slide 1 - AS Biology. Gnetic control of protein structure and function Genetic control of protein structure and function
Slide 2 - AS Biology. Gnetic control of protein structure and function The structure of DNA and RNA Genetic material of living organisms is either DNA or RNA. DNA – Deoxyribonucleic acid RNA – Ribonucleic acid Genes are lengths of DNA that code for particular proteins.
Slide 3 - AS Biology. Gnetic control of protein structure and function DNA and RNA are polynucleotides Both DNA and RNA are polynucleotides. They are made up of smaller molecules called nucleotides. DNA is made of two polynucleotide strands: RNA is made of a single polynucleotide strand: Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide Nucleotide
Slide 4 - AS Biology. Gnetic control of protein structure and function Structure of a nucleotide A nucleotide is made of 3 components: A Pentose sugar This is a 5 carbon sugar The sugar in DNA is deoxyribose. The sugar in RNA is ribose.
Slide 5 - AS Biology. Gnetic control of protein structure and function Structure of a nucleotide A Phosphate group Phosphate groups are important because they link the sugar on one nucleotide onto the phosphate of the next nucleotide to make a polynucleotide.
Slide 6 - AS Biology. Gnetic control of protein structure and function Structure of a nucleotide A Nitogenous base In DNA the four bases are: Thymine Adenine Cytosine Guanine In RNA the four bases are: Uracil Adenine Cytosine Guanine
Slide 7 - AS Biology. Gnetic control of protein structure and function Nitrogenous bases – Two types Pyramidines Thymine - T Cytosine - C Uracil - U Purines Adenine - A Guanine - G
Slide 8 - AS Biology. Gnetic control of protein structure and function Adenine
Slide 9 - AS Biology. Gnetic control of protein structure and function Guanine
Slide 10 - AS Biology. Gnetic control of protein structure and function
Slide 11 - AS Biology. Gnetic control of protein structure and function Sugar phosphate bonds (backbone of DNA) Nucleotides are connected to each other via the phosphate on one nucleotide and the sugar on the next nucleotide A Polynucleotide
Slide 12 - AS Biology. Gnetic control of protein structure and function James Watson (L) and Francis Crick (R), and the model they built of the structure of DNA
Slide 13 - AS Biology. Gnetic control of protein structure and function X-ray diffraction photograph of the DNA double helix
Slide 14 - AS Biology. Gnetic control of protein structure and function Base pairing The Nitrogenous Bases pair up with other bases. For example the bases of one strand of DNA base pair with the bases on the opposite strand of the DNA.
Slide 15 - AS Biology. Gnetic control of protein structure and function
Slide 16 - AS Biology. Gnetic control of protein structure and function
Slide 17 - AS Biology. Gnetic control of protein structure and function
Slide 18 - AS Biology. Gnetic control of protein structure and function The Rule: Adenine always base pairs with Thymine (or Uracil if RNA) Cytosine always base pairs with Guanine. This is beacuse there is exactly enough room for one purine and one pyramide base between the two polynucleotide strands of DNA.
Slide 19 - AS Biology. Gnetic control of protein structure and function Complementary base pairing Purines Pyramidines Adenine Thymine Adenine Uracil Guanine Cytosine
Slide 20 - AS Biology. Gnetic control of protein structure and function Nature of the Genetic Material Property 1 - it must contain, in a stable form, information encoding the organism’s structure, function, development and reproduction Property 2 - it must replicate accurately so progeny cells have the same genetic makeup Property 3 - it must be capable of some variation (mutation) to permit evolution
Slide 21 - AS Biology. Gnetic control of protein structure and function Replication of DNA and Chromosomes Speed of DNA replication: 3,000 nucleotides/min in human 30,000 nucleotides/min in E.coli Accuracy of DNA replication: Very precise (1 error/1,000,000,000 nt)
Slide 22 - AS Biology. Gnetic control of protein structure and function
Slide 23 - AS Biology. Gnetic control of protein structure and function
Slide 24 - AS Biology. Gnetic control of protein structure and function
Slide 25 - AS Biology. Gnetic control of protein structure and function Taylor and co-workers (1957) 3H-labelled chromosomes after one further replication in unlabelled media
Slide 26 - AS Biology. Gnetic control of protein structure and function Meselson and Stahl (1958)
Slide 27 - AS Biology. Gnetic control of protein structure and function
Slide 28 - AS Biology. Gnetic control of protein structure and function A replicating Drosophila chromosome
Slide 29 - AS Biology. Gnetic control of protein structure and function Origins initiate replication at different times.
Slide 30 - AS Biology. Gnetic control of protein structure and function
Slide 31 - AS Biology. Gnetic control of protein structure and function
Slide 32 - AS Biology. Gnetic control of protein structure and function
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Slide 38 - AS Biology. Gnetic control of protein structure and function This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.