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16 Cards in this Set
- Front
- Back
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What does DNA stand for? |
DNA stands for deoxyribosenucleic acid
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What is DNA? |
DNA is present in the nucleus of all cells in all living organisms
DNA controls all the chemical changes which takeplace in cells The kind of cell which is formed, (muscle, blood,nerve etc) is controlled by DNA The kind of organism which is produced (buttercup,giraffe,herring, human etc) is controlled by DNA |
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DNA molecule |
DNA is a very large molecule made up of a long chainof sub-units
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What are the sub-units called? |
The sub-units are called nucleotides
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What is each nucleotide is made up of? |
a sugar called deoxyribose
a phosphate group PO4 an organicbase
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What is ribose? |
Ribose is a sugar, like glucose, but with only five carbon atoms in its molecule
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What is deoxyribose? |
Deoxyribose is almost the same as ribose but lacks one oxygen atom
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What symbol may ribose and deoxyribose represent? |
Pentagon |
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What are the most common organic bases? |
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What forms a nucleotide? |
The deoxyribose the phosphate and one of the bases combine to form a nucleotide
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Joined nucleotides. |
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Two stranded nucleotides. |
In fact, the DNA usually consists of a double strand of nucleotide The sugar-phosphate chains are on the outside and the strands are held together by chemical bonds between the bases |
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Two stranded DNA |
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Which bases are always paired up? |
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What are the paired strands that are coiled into a spiral called? |
A double helix |
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The double helix |
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