DNA & Protein Synthesis How our genes make our traits.

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Presentation transcript:

DNA & Protein Synthesis How our genes make our traits

Nucleic Acids Nucleic Acids are a type of organic compound. DNA & RNA are examples. DNA is responsible for the code of every trait in an organisms body. Nucleotides are the monomers of DNA.

Nucleotides S P B There are 2 types of sugars: Deoxyriobose: (DNA) (Notice Deoxyribose is missing an oxygen) Ribose Sugar: (RNA) Each Nucleotide contains a sugar (S); one of 5 nitrogen bases (B); and a phosphate (P)

Nitrogen Bases There are 5 different types of nitrogen bases The sequence of nitrogen bases in a strand of DNA is what will determine genetic tratis DNA contains the nitrogen bases: Adenine, Guanine, Cytosine, and Thymine RNA contains:Adenine, Guanine, Cytosine and Uracil (instead of Tymine)

Types of Nucleotides based on Nitrogen Bases DA PAdenine DG PGuanine DC PCytosine DT PThymine PURINES Pyramidines

Base Pairings Sugar Phosphate Sugar VERY IMPORTANT Nitrogen base pairs only pair up the following way: Adenine w/ Thymine Guanine w/ Cytosine Look at the diagram on the right Phosphate

Assignment #1 & 2 1.Complete “Chapter 30 Modern Genetics Sect Rev 30-2” ws (Front & Back) 2.Using DNA models (work with a partner or group of 3 NO LARGER) Complete PART 1 of the DNA Structure and Replication Molecular Model Activity WRITE YOUR ANSWERS ON NOTEBOOK PAPER (DO NOT TURN THE PAPER IN. YOU WILL USE IT TO FINISH THE LAB)

DNA replication 1.DNA unwinds 2.Double helix will unzip with the help of an enzyme called helicase 3.The complementary bases (A with T and G with C) will be added to each side of the old molecule. 4.The DNA will rewind or twist. NOTICE: Each of the 2 new DNA molecules will contain 1 new strand and 1 strand from the original molecule

DNA replication Draw this in your notes

Assignment #3 3. Using DNA models (work with a partner or group of 3) Complete PART 2 of the DNA Structure and Replication Molecular Model Activity Add the answers to the questions to the notebook paper that you used to complete assignment #2. When finished turn you paper into the appropriate period bin.