I dont remember much of biology but i do remember my teacher saying something about phosphate backbone, i know its not much help. sorry!!
Thymine, Guamine, cytosine, and atanine make up the steps in dna (the nitrogenous bases) but the sided are a patter of phosphate then sugar.
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Answer: the <span>Permian–Triassic extinction event ; {"end of the Permian era"} .
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There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.
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Answer: Weight can be measured in pounds.
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