Protein Synthesis

Biology challenge: Protein synthesis involves two steps: transcription (DNA → mRNA) and translation (mRNA → protein).

Scenario

A section of DNA template strand reads 3'-TAC-GAA-CCT-5'. You need to transcribe it to mRNA, then translate it to amino acids using the genetic code.

Question 1

Transcribe the DNA template 3'-TAC-GAA-CCT-5' to mRNA. What is the mRNA sequence?

5'-AUG-CUU-GGA-3'5'-TAC-GAA-CCT-3'5'-UGA-GUU-GCC-3'5'-AUG-GAA-CCU-3'

Question 2

The codon AUG codes for the amino acid Methionine AND signals:

A stop codonA splice siteThe start of translationAn intron boundary

Question 3

A point mutation changes codon GUU to GUC. Both code for Valine. This mutation is called:

Missense mutationNonsense mutationSilent (synonymous) mutationFrameshift mutation

Question 4

How many amino acids would be encoded by a mRNA with 900 nucleotides (excluding start/stop codons)?

Your answeramino acids

Answer keys, scoring tolerance, XP, and awards stay on the server. Retrying the same attempt cannot award twice.

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