Question

questions:

1. what 3 codons act as termination signals (stop)?

uaa uga
uag

1. what codon means start?

methionine

1. list all of the codons for leucine. (leucine is on the chart twice)

cuu uua
cuc uug
cua
cug
name all the codons for these amino acids: (some are on the chart more than once)

1. phenylalanine - uuu, uuc
2. serine - agc, agu, ucu, ucc, uca, ucg
3. isoleucine -
4. valine -
5. glycine -
6. alanine -
7. if the dna sequence is --- aaa tat ccg tag caa atg, write the mrna sequence, trna anticodon sequence, and the six amino acids for this.

dna: aaa tat ccg tag caa atg
mrna:
amino acid (1st 3 letters):

Explanation:

Step1: Transcribe DNA to mRNA

In transcription, DNA bases (A - T, C - G) pair with mRNA bases (U - A, G - C).
For DNA: AAA TAT CCG TAG CAA ATG
mRNA: UUU AUA GGC AUC GUU UAC

Step2: Find tRNA anticodons

tRNA anticodons pair with mRNA codons (A - U, G - C).
mRNA: UUU AUA GGC AUC GUU UAC
tRNA: AAA UAU CCG UAG CAA AUG

Step3: Translate mRNA to amino acids

Using the genetic code:

• UUU = Phe (Phenylalanine)
• AUA = Ile (Isoleucine)
• GGC = Gly (Glycine)
• AUC = Ile (Isoleucine)
• GUU = Val (Valine)
• UAC = Tyr (Tyrosine)

Answer:

mRNA: UUU AUA GGC AUC GUU UAC
tRNA: AAA UAU CCG UAG CAA AUG
Amino Acids: Phe, Ile, Gly, Ile, Val, Tyr