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DNA
Start of Term Paper
Deoxyribonucleic acid and ribonucleic acid are two chemical substances involved
in transmitting genetic information from parent to offspring. It was known early
into the 20th century that chromosomes, the genetic material of cells, contained
. .... Middle of Term Paper
... in plants, and mitochondria in plants and animals.
All DNA molecules contain a set of linked units called nucleotides. Each
nucleotide is composed of three things. The first is a sugar called deoxyribose.
Attached to one end of the sugar is a phosphate group, and at the other is one
of several nitrogenous bases. DNA contains four nitrogenous bases. The first two,
adenine and guanine, are double-ringed purine compounds. The others, cytosine
and thymine, are single-ringed pyrimidine compounds. (Miller, 141) Four types of
DNA nucleotides can be formed, depending on which nitrogenous base is involved.
The phosphate group of each nucleo ... |
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