Term
DNA:
(deoxyribonucleic acid)
a molecule that is present in all living cells & that contains the info that determines the traites that a living thing inherits & needs to live
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Definition
a molecule that is present in all living cells & that contains the info that determines the traites that a living thing inherits & needs to live
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| one set of instructions for an inherited trait |
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| in a nucleic-acid chain, a subunit that consists of a sugar, a phosphate, and a nitrogenous base |
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the 4 bases are adenine, thymine, guanine, and cytosine; each base is a different shape;
scientists often refer to a base by the first letter of the base, A, T, C, or G |
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| 2 sides of the ladder are made of alternating sugar parts and phosphate parts; a strand of DNA looks like a twisted ladder, known as a double helix |
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| the bases on each side of the molecule are used as a pattern for a new strand; a DNA molecule is split down the middle, where the bases meet |
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Complimentary:
(as it relates to DNA) |
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| as the bases on the original molecule are exposed, complimentary nucleotides are added to each side of the ladder |
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Adenine always pairs with Thymine
and
Cytosine always pairs with Guanine
A:T
C:G |
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| used x-ray diffraction to make images of DNA that helped reveal the structure of DNA |
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Erwin Chargaff:
(Chargaff's Rule) |
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| found that the amount od Adenine in DNA always equals the amount of Thymine |
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| James Watson and Francis Crick: |
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Definition
| concluded that DNA must look like a long, twisted ladder; they built a model which later helped explain how DNA functions and how it is copied |
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