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| Unit 1: Demos |
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Can You Make DNA? Play
the Double Helix game and find out! Does DNA have an overall charge? How
is DNA replicated? Okazaki
fragments Can you control the cell cycle? Play
the Cell Cycle game and find out! Centromere Sequence (16c) 3 ways eukaryotic and prokaryotic chromosomes differ (17b) Asexual
reproduction Slides
- oogenesis in Ascaris |
Does DNA have an overall charge? To answer this question, think about the structure of the nucleotides, their charge, and how the nucleotides are joined to an existing DNA chain. Recall that the DNA chains are always synthesized in the 5' ––> 3' direction on the DNA template, and that the deoxynucleotides are joined through condensation reactions only to the 3'–OH end of the chain. The phosphate group will retain its negative charge, and thus DNA is negatively charged.
The bond that forms between the nucleotide being added and the pre-existing chain is called a phosphodiester bond and is a strong covalent bond. |
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