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Definition
| The basic building block of DNA and RNA, composed of a pentose sugar, a phosphate group, and one of four different nitrogen bases. |
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Definition
| Covalent bond connecting two nucleotides in a polynucleotide chain. |
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Definition
| The "twisted ladder" conformation of DNA. |
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Definition
| Describes the relationship between two strands of a nucleic acid in which the two strands are parallel to each other but in opposite orientations. |
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| Complementary base pairing |
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Definition
| Formation of hydrogen bonds between A and T and between G and C on opposite strands of a DNA molecule. |
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Definition
| The idea that genetic information flows from DNA to RNA to protein during gene expression. |
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Definition
| A DNA mass within a bacterium, chloroplast, or mitochondrion. |
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Definition
| The substance of chromosomes, consisting of DNA and associated proteins. |
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Definition
| Decondensed chromatin that is transcriptionally active during interphase. |
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Definition
| Highly condensed chromatin that is transcriptionally inactive. |
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Definition
| The basic unit of chromatin, consisting of a length of DNA wrapped around a core of histone proteins. |
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Term
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Definition
| Major proteins of chromatin, that are rich in basic, positively charged amino acids and that bind tightly to DNA. |
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Definition
| The tip or end of a linear chromosome, consisting of repeated copies of a simple noncoding sequence. |
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