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DNA and RNA are polymers (in the case of DNA, often very long polymers), and are made up of monomers known as nucleotides. When these monomers combine, the resulting chain is called a polynucleotide (poly-= "many").

DNA和RNA的结构及功能。 核苷酸和多核苷酸。 mRNA、rRNA、tRNA、miRNA、和siRNA。

Khan Academy

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Molecular structure of RNA (video) | Khan Academy

The basic idea here is that the two ends of a strand of DNA or RNA are different from each other. At the 5’ end of the chain, the phosphate group of the first nucleotide in the chain sticks out. At the other end, called the 3’ end , the hydroxyl of the last nucleotide added to the chain is exposed.

Misyonumuz herkese, her yerde, dünya standartlarında ve ücretsiz eğitim imkanı sağlamaktır.

In order to understand the biological function of DNA, you first need to understand its molecular structure. This requires learning the vocabulary for talking about the building blocks of DNA, and how these building blocks are assembled to make DNA molecules.

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