Download Cells Use DNA and RNA to Make Proteins

DNA provides the code for each protein
Proteins and Amino Acids
1. 20 different aa’s
2. some small proteins and some very large
3. cells put together sequences of aa’s
4. DNA provides the info to sequence aa’s
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DNA and the Genetic Code
1. nucleotides: A, T, C, G
2. Adenine, Thymine, Cytosine, Guanine
3. A pairs with T; C pairs with G
4. every three bases codes for one amino
acid – called a DNA triplet
5. ex: GAC codes for aspartic acid
6. ex: CAG codes for glutamine
during interphase in nucleus
DNA “unzips”
free nucleotides in cytoplasm find their
“home”
4. result: 2 new copies of original DNA
5. 1 for each daughter cell
6. DNA strand acts as template for
complementary base pairs – A&T G&C
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