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Questions and Answers
Which component forms a glycosidic bond with the 9 nitrogen of deoxyribose?
Which component forms a glycosidic bond with the 9 nitrogen of deoxyribose?
- Thymine
- Cytosine
- Guanine (correct)
- Adenine
Which nitrogenous base is present in RNA but not in DNA?
Which nitrogenous base is present in RNA but not in DNA?
- Cytosine
- Adenine
- Guanine
- Uracil (correct)
What type of bond forms between the phosphate group and the deoxyribose sugar?
What type of bond forms between the phosphate group and the deoxyribose sugar?
- Ester bond (correct)
- Covalent bond
- Hydrogen bond
- Ionic bond
Which component is common to both DNA and RNA nucleotides?
Which component is common to both DNA and RNA nucleotides?
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Which type of structure is formed by the linear sequence of nucleotides?
Which type of structure is formed by the linear sequence of nucleotides?
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Study Notes
DNA and RNA Structure
- The nitrogenous base that forms a glycosidic bond with the 1' carbon of deoxyribose is a nucleobase (adenine, guanine, cytosine, or thymine).
RNA Composition
- Uracil is the nitrogenous base present in RNA but not in DNA.
Phosphodiester Bond
- A phosphodiester bond forms between the phosphate group and the 3' and 5' hydroxyl groups of the deoxyribose sugar.
Common Components
- The components common to both DNA and RNA nucleotides are a nitrogenous base, a five-carbon sugar (deoxyribose in DNA and ribose in RNA), and a phosphate group.
Nucleotide Sequence
- The linear sequence of nucleotides forms a polynucleotide chain or a single-stranded DNA or RNA molecule.
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