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| are the units of heredity and are made of nucleic acid (DNA). |
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| are polymers of nucleotides linked together by dehydration synthesis reactions. |
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| are the building block molecules of a nucleic acid and are composed of a sugar, a phosphate group, and a nitrogenous base |
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| The _______ and _________ form the nucleic acid backbone. |
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| There are two families of nitrogenous bases: |
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| nitrogenous bases characterized by a six-membered ring made up of carbon and nitrogen atoms |
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| nitrogenous bases characterized by a five-membered ring fused to a six-membered ring where both rings are made up of carbon and nitrogen atoms |
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| Evidence that DNA is the genetic material: |
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Definition
-In a eukaryotic cell, the DNA content doubles prior to cell division
-During cell division the doubled DNA is divided equally between the two daughter cells |
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| who discovered the double helix? |
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| Watson and Crick (and others) |
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| studied Understanding the structure of DNA and Physical structure evidence. Gifted x-ray crystallographer |
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| 2 strands of DNA are _________ |
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| DNA in a typical human cell is about: |
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| what did thee human genome project reveal? |
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| that most of the DNA of humans does not encode mRNAs or any other RNAs. Appear to serve no purpose whatsoever in our life cycle. |
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| the Y-shaped regions of replicating DNA molecules where new strands are growing |
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| synthesis of new DNA strands occurs in ______ direction |
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| DNA synthesis is _________ |
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