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In most organisms, how many polynucleotide strands typically make up an RNA molecule?
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7. DNA and Chromosome Structure
RNA
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RNA differs from DNA in that RNA typically:
A
is composed of amino acids linked by peptide bonds
B
contains ribose sugar and uses uracil instead of thymine
C
contains deoxyribose sugar and uses thymine instead of uracil
D
is usually double-stranded and lacks any nitrogenous bases
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Identify the key structural components of DNA and RNA, focusing on the sugar and nitrogenous bases present in each molecule.
Recall that DNA contains deoxyribose sugar, while RNA contains ribose sugar, which has one more oxygen atom than deoxyribose.
Understand that DNA uses the nitrogenous base thymine (T), whereas RNA uses uracil (U) instead of thymine.
Note the typical strand structure: DNA is usually double-stranded forming a double helix, while RNA is usually single-stranded.
Combine these facts to distinguish RNA from DNA by recognizing that RNA contains ribose sugar and uses uracil instead of thymine.
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