EXPEDITION 7 / 8 · COLLEGE BOARD UNIT 6

Gene Expression and Regulation

Information flow and gene control

Your pace. Your study mode.80 flashcards · 20 MCQs

HANDS-ON · Mutation workshop

Change DNA. Trace the consequences.

Edit the coding strand, substitute one base, or delete one. Compare RNA codons and amino acids.

Coding DNA · 5′ → 3′

Base position (starting at 1)6

Replace with

Reference DNAATGGAATTTTAA

Met → Glu → Phe → Stop

Current RNA · 5′ → 3′AUGGAAUUUUAA

AUGMet

GAAGlu

UUUPhe

UAAStop

Reference sequence

Coding-strand demonstration using the standard genetic code. The reading frame starts at base 1 and display stops at the first stop codon. Trailing incomplete codons are not translated; this is not a complete gene-expression simulator.

Try this

Make a one-base change that preserves the displayed protein. Hint: explore a codon’s third base.

Original BioQuest teaching models. Explore the OpenStax Biology reference. Gene regulation · Oxidative phosphorylation