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Explanation on what genes, DNA and chromosomes are 

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Explanation on what genes, DNA and chromosomes are 

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The cell's nucleus contains chromosomes made from long DNA molecules. The diagram shows the relationship between the cell, its nucleus, chromosomes in the nucleus, and genes.

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Step 1: Replication Fork Formation
Step 2: Primer Binding
Step 3: Elongation
Step 4: Termination

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The base pairing of guanine (G) and cytosine (C) is just the same in DNA and RNA. So in RNA the important base pairs are: adenine (A) pairs with uracil (U); guanine (G) pairs with cytosine (C).

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L-ribose - not naturally occuring.
D-ribose - occurs in nature in RNA.

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Cytosine (C) and thymine (T) are the smaller pyrimidines. RNA also contains four different bases. Three of these are the same as in DNA: adenine, guanine, and cytosine. RNA contains uracil (U) instead of thymine (T).

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Even though RNA is single-stranded (unlike DNA, which is made up of two strands), it can still form complementary base pairs. Complementary sections within a single strand of RNA can base-pair with each other, causing the molecule to fold in on itself and form a complex, three-dimensional shape.

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Ribonucleic acid

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A with T: the purine adenine (A) always pairs with. the pyrimidine thymine (T)

C with G: the pyrimidine cytosine (C) always pairs with. the purine guanine (G)

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DNA and RNA is the sugar, with 2-deoxyribose being replaced by the alternativepentose sugar ribose in RNA. The four bases found in DNA are adenine (abbreviated A), cytosine (C), guanine (G) and thymine (T).

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n DNA, there are four different bases: adenine (A) and guanine (G) are the larger purines. Cytosine (C) and thymine (T) are the smaller pyrimidines.

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double helix

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Deoxyribonucleic acid