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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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John has discovered that he has a mutation in one of his DNA base pairs. He is worried that this will cause his proteins to come out all wrong. However, John is perfectly fine. Why?
  1. Each amino acid has multiple DNA codons.
  2. Mutated DNA doesn’t cause mutated proteins.
  3. DNA isn’t used to create proteins, so there is no problem for John.
  4. A single mutation cannot cause a DNA mismatch.
  5. John won’t be fine. He’ll just have to wait and see.
Explanation
Answer: A - The amino acids have multiple codons which can signal for that amino acid. For example, leucine can be CUG or CUA. If the G happens to mutate to an A, nothing happens to the protein as a whole. Thus, John will be just fine.
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