Biology 1201A Study Guide - Midterm Guide: Matthew Meselson, Franklin Stahl, Isotopes Of Nitrogen

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2 Apr 2018
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Bond holds the nucleotides together (covalent bond); this bond bridges the phosphate group of the 5(cid:859) (cid:272)ar(cid:271)o(cid:374) of o(cid:374)e sugar to the 3(cid:859) (cid:272)ar(cid:271)o(cid:374) of the (cid:374)e(cid:454)t sugar up ahead: the two strands are anti-parallel. As we know that the purines are: adenine and guanine; and pyrimidines are: cytosine and. Thymine; in the double stranded dna, a purine binds to a pyrimidine (hydrogen bonds) in between the sugar-phosphate backbone. Adenine binds with thymine and guanine binds with cytosine. A-t has 2 hydrogen bonds and g-c has 3 hydrogen bonds this is known as complimentary base-pairing. Initially, 15n was at the bottom because it was heavy; and then after one generation there were. 2 density lines: 15n and 15n-14n; and then the next generation had 15n-14n and 14n-14n: this means that when the dna strands split up for replication, the free floating nucleotides in.

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