Podcast
Questions and Answers
Which of the following statements is TRUE about the structure of DNA and RNA?
Which of the following statements is TRUE about the structure of DNA and RNA?
- DNA has deoxyribose while RNA has ribose. (correct)
- DNA contains uracil while RNA contains thymine.
- Both DNA and RNA are double-stranded.
- DNA and RNA have the same four nitrogenous bases.
Which nitrogen base is found in RNA but not in DNA?
Which nitrogen base is found in RNA but not in DNA?
- Uracil (correct)
- Adenine
- Thymine
- Guanine
Which of the following correctly describes the relationship between purines and pyrimidines?
Which of the following correctly describes the relationship between purines and pyrimidines?
- Purines and pyrimidines are both single-ring structures.
- Purines and pyrimidines are both double-ring structures.
- Purines are double-ring structures while pyrimidines are single-ring structures. (correct)
- Purines are single-ring structures while pyrimidines are double-ring structures.
What is the sugar molecule found in RNA called?
What is the sugar molecule found in RNA called?
What is the main difference between DNA and RNA in terms of structure?
What is the main difference between DNA and RNA in terms of structure?
Flashcards
Nucleotide
Nucleotide
The basic building block of DNA, consisting of a sugar, phosphate, and a nitrogen base.
Components of a nucleotide
Components of a nucleotide
A nucleotide contains a five-carbon sugar (deoxyribose), a phosphate group, and one of four nitrogen bases.
Purines vs. Pyrimidines
Purines vs. Pyrimidines
Adenine and guanine are purines (double-ring), while cytosine and thymine are pyrimidines (single-ring).
RNA
RNA
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Base pairing in RNA
Base pairing in RNA
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Study Notes
Nucleotides
- Nucleotides are the building blocks of DNA
- Each nucleotide is made up of a five-carbon sugar (pentose), a phosphate group, and a nitrogenous base
- Deoxyribose sugar is the pentose sugar in DNA
- The four nitrogen bases in DNA are adenine (A), guanine (G), cytosine (C), and thymine (T)
- Adenine and guanine are double-ring structures called purines
- Cytosine and thymine are single-ring structures called pyrimidines
RNA
- RNA is another molecule that carries biological information
- RNA is similar to DNA but is single-stranded
- RNA uses a ribose sugar instead of deoxyribose
- The four nitrogenous bases in RNA are adenine (A), guanine (G), cytosine (C), and uracil (U)
- Cytosine pairs with guanine
- Adenine pairs with uracil
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