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# Review ## Chromosomes * 46 chromosomes in each cell (23 pairs) * Hold DNA that is coiling (more info in smaller space) * DNA: organism's genetic material * Contains information that helps us: * Grow * Reproduce * Maintain itself ## Shape of DNA * Double helix * Have nucleotides in...

# Review ## Chromosomes * 46 chromosomes in each cell (23 pairs) * Hold DNA that is coiling (more info in smaller space) * DNA: organism's genetic material * Contains information that helps us: * Grow * Reproduce * Maintain itself ## Shape of DNA * Double helix * Have nucleotides in the middle * (teeth of twisted zipper) * Adenine (A) goes with Thymine (T) * Guanine (G) pairs with Cytosine (C) ## Example of Complementary Base Pairing EX. ACGCTA ||| TGCGAT ## DNA Replication * Makes copies of DNA * DNA strand unzips and nucleotide bases are copied * We have excess DNA on our chromosomes—junk DNA ## Chromosomes Hold 1. DNA 2. Information to make proteins ## RNA * Single strand that gets information from DNA to make proteins * Transcription: RNA copies information from DNA * Translation: RNA uses information to make proteins