From DNA to Protein: The Molecular Code of Life
Key takeaways
- Complementary pairs: DNA pairs A with T through two hydrogen bonds, and C with G through three. In double-stranded DNA, %A = %T and %C = %G.
- The RNA substitution: Messenger RNA uses U instead of T. It carries a copy of the instructions from the nucleus into the cytoplasm.
- Codons and reading frames: A ribosome reads mRNA in three-base codons. Matching tRNA anticodons help deliver amino acids; stop codons signal release rather than another amino acid.
- Mutations and protein function: Amino acid order influences protein folding and function. A base substitution may leave the amino acid unchanged (silent) or change it (missense). Inserting or deleting bases in a number not divisible by three shifts the downstream reading frame. Effects can be harmful, beneficial, or neutral, not always a collapsed protein.
The factory uses a shortened 20-amino-acid illustration, not the actual sequences of its example proteins. The chameleon is a fictional trait model. Supplied high-school readiness connections are NGSS HS-LS1-1, Florida SC.912.L.16.5, Virginia BIO.5.a, b, and North Carolina Bio.3.1.2. All five curriculum mappings appear in the parent guide below.
