The molecule in the graphic above would be physically part of (ignore the dotted

Question

The molecule in the graphic above would be physically part of (ignore the dotted box in the graphic above): a Protein b. Lipid c. DNA d. rRNA e. Amino acid Which one is better for living systems--both in the short term (the life cycle of a cell) and on an evolutionary time scale? a. 3'-5'-phosphodiester bonds in DNA that are unbreakable once formed b. 3'-5'-phosphodiester bonds in RNA that are unbreakable once formed c. 3'-5'-phosphadiester bonds in DNA that are more stable compared to RNA: however, in both DNA and RNA the 3'-5' phosphodiester bonds can be broken d. Stable 2'-5'-phosphodiester bonds in DNA along with the less stable 3'-5'-phosphodiester bonds in RNA. e. Hydrogen bonding that stabilizes DNA but does not stabilize RNA The molecule in the graphic above would be physically part of what part of a living cell (ignore the dotted box in the graphic above): a. Protein b. Lipid c. DNA d. rRNA e. None of the above The type of covalent bond that holds DNA together is ______. The same bond holds RNA together too: a. 3'-4'-phosphodiester linkages b. 3'-5'-phosphodiester linkages c. hydrogen bonds d. 1, 4-gycosidic linkages e peptide bond

Explanation / Answer

1. rRNA

2. C.

3. DNA

4. 3', 5' phosphodiester linkages

A phosphodiester bond will be formed between any adjacent nucleotides. A polynucleotide chain would have a direction so that, if it starts from C3, it would end in C5 and if it starts from C5 it would end in C3.

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