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.