Challenge 1
Assess an early insertion
Explain why one inserted nucleotide near the start can affect more of the protein than a later substitution.
Application library0/4 attempted
B.7C·Biology·DNA & Protein Synthesis
Mutations in the real world
Explain how substitutions, insertions, and deletions in DNA can change proteins and traits.
Transfer evidence, not just familiar practice
Correctly solve different fresh variations at least 24 hours after your first correct transfer response. Reviewing the same challenge again does not count as fresh retention evidence.
You can explore every situation now. Practice unlocks after you retain B.7B.
Career · Genetic engineering and clinical genomics
Gene editing review board
A review board evaluates two edits: one inserts a nucleotide immediately after a bacterial start codon, and another creates a premature stop codon in a human disease allele.
Why this TEKS matters
The location and type of a DNA change determine whether reading frames shift or translation ends early, which can strongly alter protein function.
Challenge 2
Classify a premature stop
Identify the mutation outcome created when an amino-acid codon becomes a stop codon.
Everyday life · Personal genomics and science media
Understanding DNA test results
A DNA report describes one substitution that leaves the amino acid unchanged and another deletion that removes exactly one internal codon from an engineered enzyme.
Why this TEKS matters
Not every mutation changes a protein in the same way: silent substitutions preserve an amino acid, while in-frame deletions remove one without shifting later codons.
Challenge 3
Interpret a silent substitution
Predict the likely outcome when GCU and GCC both specify alanine.
Challenge 4
Interpret an in-frame deletion
Determine the direct effect of removing all three nucleotides of one internal codon.