Following are some statements about the structural features of nucleic acids. ld

Question

Following are some statements about the structural features of nucleic acids. ldentify whether the statement refers to DNA, to RNA, to both, or to neither by dragging the statement into the appropriate bin Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly DNA In base composition, %A = %C Secondary structure is RNA Both DNA and RNA Neither Sugars are connected with a 3-5 phosphodiether link Can exist in a great variety of, and often unique, secondary structures Contains equal amounts of purines and pyrimidines. Sometimes contains the unusual nucleoside ribothymidine (5-methyluridine) Bases are attached to sugars in a p-N-glycosidic linkage primarily a double helix Contains the sugan 2'-deoxyribose Contains the pyrimidine uracil. Contains the pyrimidine cytosine Contains the sugar 3'-deoxyribose Review Chargaff's rules describing the ratio (or percent) of purines and pyrimidines. Do these rules describe DNA, RNA, both, or neither?

Explanation / Answer

DNA

Secondary structure is primary double helix

contains the sugar 2'-deoxyribose

contains the sugar 3'-deoxyribose

RNA

sometimes contains the unsual nucleoside ribothymidine-(5-methyluridine)

conatins pyrimidine uracil

Both DNA and RNA

contains the pyrimidine cytosine

bases are attached to sugars by beta-N-glycosidic linkage

contains equal amounts of purines and pyrimidines

Neither

In base composiiton %A = %C

sugars are connected with a 3,5'-phosphodiether link

can exist in a great varietyof and often unique, secondary structures.

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