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Definition
| The often massive differences in genome size observed among eukaryotic organisms |
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Definition
| Coiling of double-stranded DNA in which strain caused by overwinding or underwinding of the duplex makes the double helix itself twist |
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Definition
| When the covalently closed circular DNA molecule is not twisted other than helical twisting |
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Term
| What are the two ways DNA responds to underwinding? |
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Definition
- It forms regions with "bubbles" in which the bases are unpaired
- It twists the circular molecule in the opposite sense fron the direction of underwinding
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Term
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Definition
Supercoiling of DNA that counteracts underwinding of the DNA
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Definition
- An enzyme that introduces or eliminates either underwinding or overwinding
- Does this by introducing a single-strand break, changing the relative positions of the strands, and sealing the break
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Term
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Definition
| Any of the small basic proteins bound to DNA in chromatin |
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Term
| What are the 5 major types of histones? |
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Definition
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Definition
| When the variation between organisms is very small |
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Definition
| The bead-like units in chromatin |
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Definition
| The aggregate of histones and DNA in a nucleosome without the linking DNA |
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Definition
| Region at the amino end of histone subunits that is susceptible to chemical modification affecting gene activity |
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Definition
| The three-dimensional region occuppied by a particular chromosome in the nucleus of an interphase or noncycling cell |
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