AP Biology Questions on Point Mutations

📚 Quick Study Guide

🧬 Point Mutation Definition: A change affecting only one or a few nucleotides in a gene sequence. 📝 Types of Point Mutations:
• 📍 Substitutions: One nucleotide is replaced by another.
• ➕ Insertions: One or more nucleotides are added into the sequence.
• ➖ Deletions: One or more nucleotides are removed from the sequence.
🔬 Substitution Types:
• 🤫 Silent Mutation: Change in the nucleotide sequence does not change the amino acid produced.
• 😵‍💫 Missense Mutation: Change in the nucleotide sequence results in a different amino acid.
• 🛑 Nonsense Mutation: Change in the nucleotide sequence results in a premature stop codon.
⚙️ Frameshift Mutations: Insertions and deletions that alter the reading frame of the mRNA. 🤕 Impact: Point mutations can have a range of effects, from no noticeable change to a complete loss of function.

🧪 Practice Quiz

1. What type of point mutation results in a premature stop codon?
   1. Silent mutation
   2. Missense mutation
   3. Nonsense mutation
   4. Frameshift mutation
2. A mutation where one nucleotide is replaced by another is called a(n):
   1. Insertion
   2. Deletion
   3. Substitution
   4. Frameshift
3. Which of the following mutations does NOT cause a frameshift?
   1. Insertion of one nucleotide
   2. Deletion of two nucleotides
   3. Insertion of three nucleotides
   4. Deletion of one nucleotide
4. A silent mutation results in:
   1. A different amino acid
   2. A premature stop codon
   3. No change in the amino acid sequence
   4. A completely non-functional protein
5. What is the most likely outcome of a frameshift mutation?
   1. A slightly altered protein
   2. A non-functional protein
   3. A protein with one amino acid change
   4. No change in the protein
6. Which of the following is an example of a transversion mutation?
   1. Adenine to Guanine
   2. Cytosine to Thymine
   3. Guanine to Adenine
   4. Adenine to Cytosine
7. A missense mutation results in:
   1. No change in the protein sequence
   2. A premature stop codon
   3. A different amino acid in the protein
   4. A truncated protein