3\' end Om 5 end ram of DNA shown, circle and label 18) A phosphodiester linkage

Question

3' end Om 5 end ram of DNA shown, circle and label 18) A phosphodiester linkage. Include all atoms that comprise this make up this linkage. 19) Is this covalent or not? yes no (circle choice) 20)) What two functional groups are involved in a dehydration reaction to form this linkage and on which carbons (#145) are they located? Make clear which functional group was attached to which carbon. 21) On the leftmost strand of DNA, label the 5' and 3' ends. 22) Using the options, look at where the H bonds are in DNA. I'm sure you already know these are between the nitrogenous bases and they join the two strands. Compare this now to RNA http //darwin wcupa edu/beneski/projects/ismo/nucleicacids 3.htm Choose first the RNA, then look at the 5S rRNA (used in making ribosomes) as well as the tRNA Change the representation to "wireframe" to get a better look at the rRNA and tRNA. Put H bonds , (on)

Explanation / Answer

18) The phosphodiester bond is present on the 3' end i.e, on the 3rd carbon atom.

19) Yes, it is a strong covalent bond.

20) The two hydroxyl groups are involved and they are attached on the 3rd and 5th carbon atoms respectively.

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