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Today: How do genes work? Discussions begin/began this week. Homework #1 posted. Fig 5.26. Information flow in cells. Protein. Fig 5.21. Proteins are the “doers” of the cell. They act as: Enzymes Structural Support Transporters Signals. Proteins are a string of amino acids.
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Today: How do genes work? Discussions begin/began this week. Homework #1 posted
Fig 5.26 Information flow in cells Protein
Fig 5.21 • Proteins are the “doers” of the cell. • They act as: • Enzymes • Structural Support • Transporters • Signals Proteins are a string of amino acids
The relationship between DNA and genes a gene - DNA used to produce RNA or protein promoter coding region terminator non-gene DNA
In humans: Each cell contains ~6 billion nucleotides of DNA. This DNA is ~2 meters long and 2 nm wide. ~98% does not directly code for amino acids In a single human cell only about 3-5% of genes are expressed at a time. DNA Composition:
Fig 6.2 Length of human DNA in each cell The length of DNA in each of your cells is longer than you are tall. Width of DNA Power of ten: http://www.youtube.com/watch?v=A2cmlhfdxuY
In humans: Each cell contains ~6 billion base pairs of DNA. This DNA is ~2 meters long and 2 nm wide. ~1.5% directly codes for amino acids ~25% is genes In a single human cell only about 5-10% of genes are expressed at a time. DNA Composition:
The relationship between DNA and genes a gene - DNA used to produce RNA or protein promoter coding region terminator non-gene DNA
20 amino acids in proteins fig 5.17 4 nucleotides in DNA ? fig 16.5
How can 4 nucleotides code for 20 amino acids? IF Ratio (nucleotide:amino acid) Possible combinations 1:1 41 4
How can 4 nucleotides code for 20 amino acids? IF Ratio (nucleotide:amino acid) Possible combinations 1:1 41 4 2:1 42 16
How can 4 nucleotides code for 20 amino acids? IF Ratio (nucleotide:amino acid) Possible combinations 1:1 41 4 2:1 42 16 3:1 43 64
How can 4 nucleotides code for 20 amino acids? • IF • Ratio • (nucleotide:amino acid) Possible combinations • 1:1 41 4 • 2:1 42 16 • 3:1 43 64 • There are more possible combinations than amino acids.
fig 17.4 Combinations of 3 nucleotides code for each 1 amino acid in a protein.
Differences between DNA and RNA Fig 5.27
fig 17.4 Combinations of 3 nucleotides code for each 1 amino acid in a protein.
fig 17.5 the Genetic Code
Changes in DNA can change the protein Fig 17.22
The fat cat ate the rat. change one letter The zat cat ate the rat.
The fat cat ate the rat. change one letter The zat cat ate the rat. delete one letter The atc ata tet her at.
fig 17.4 Combinations of 3 nucleotides code for each 1 amino acid in a protein.
fig 5.26 The information in genes is what to make andwhen to make it. Protein
Genes have three basic parts a gene promoter coding region terminator non-gene DNA
fig 5.26 Genes contain the information to make RNA and/or proteins. The information in genes is what to make andwhen to make it. Protein
fig 21.7 Genes are replicators (selfish gene)
fig 19.4 Viruses infect living cells, take over, and produce more virus.
fig 21.8 Transposons
fig 21.9 Genes are replicators (selfish gene) Transposons: mobile DNA
fig 21.8 Barbara McClintock, discoverer of transposons
fig 21.9 Genes are replicators (selfish gene) Transposons: mobile DNA
fig 21.7 Genes are replicators (selfish gene)
Next: How do your genes make you, you? Discussions begin/began this week. Homework #1 posted