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What is a key difference between DNA and RNA?

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Question: What is a key difference between DNA and RNA?

Options:

  1. DNA is single-stranded, RNA is double-stranded
  2. RNA contains uracil instead of thymine
  3. DNA is found in the cytoplasm, RNA is found in the nucleus
  4. RNA is more stable than DNA

Correct Answer: RNA contains uracil instead of thymine

Solution: 

RNA contains uracil (U) in place of thymine (T), which is found in DNA, making this a key difference between the two nucleic acids.

What is a key difference between DNA and RNA?

Practice Questions

Q1
What is a key difference between DNA and RNA?
  1. DNA is single-stranded, RNA is double-stranded
  2. RNA contains uracil instead of thymine
  3. DNA is found in the cytoplasm, RNA is found in the nucleus
  4. RNA is more stable than DNA

Questions & Step-by-Step Solutions

What is a key difference between DNA and RNA?
Correct Answer: RNA contains uracil (U) instead of thymine (T) found in DNA.
  • Step 1: Understand that DNA and RNA are both types of nucleic acids.
  • Step 2: Know that DNA stands for deoxyribonucleic acid and RNA stands for ribonucleic acid.
  • Step 3: Learn that DNA has four bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
  • Step 4: Learn that RNA also has four bases: adenine (A), uracil (U), cytosine (C), and guanine (G).
  • Step 5: Notice that the key difference is that RNA has uracil (U) instead of thymine (T), which is found in DNA.
  • Nucleotide Composition – DNA contains thymine (T), while RNA contains uracil (U), which is a fundamental difference in their nucleotide structures.
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