CinnaEntry Start free
TEAS ScienceChanges in the DNA sequence

MutationsATI TEAS 7 cheat sheet

Changes in the DNA sequence

8 key facts Reviewed Oct 2026
Practice questions Save in app
The 1-minute sheetCinnaEntry

Point Mutations

  • Substitution — one base swapped
  • Silent — no amino acid change
  • Missense — different amino acid
  • Nonsense — creates an early stop codon

Frameshift

  • Insertion or deletion shifts the whole reading frame
  • Usually far more damaging than a substitution

Causes

  • Replication errors, radiation, chemicals, some viruses

Effects

  • Harmful, neutral or occasionally beneficial — the raw material of evolution
Key takeaway

Changes in the DNA sequence

Common causes

  • Replication errors, radiation, chemicals, some viruses
CinnaEntry website
CinnaEntry app: the study feed with a practice question
Study Mutations in the appTEAS 7 and HESI A2 question banks with a rationale on every answer and timed practice tests.See how CinnaEntry works
Start free
Want more TEAS Science questions?We'll email you a free set on Mutations. No account needed.

Was this helpful?

Free to start

Know mutations cold

TEAS 7 and HESI A2 question banks with a rationale on every answer and timed practice tests.

  • TEAS 7 & HESI A2 question banks
  • Rationale on every answer
  • Timed full-length practice tests
  • 300+ cheat sheets
Start free on the web Download on theApp Store Get it onGoogle Play
See how CinnaEntry works
CinnaEntry website
CinnaEntry app: the study feed with a practice question