Biochemistry Concept Question

[premedsp]

Advertisement - Members don't see this ad

Hi all,
I had a question about DNA, mRNA, tRNA and codons. I was doing the mcat practice questions and I seem to be getting this one set of questions wrong.
The question is: The three base sequences listed below are DNA sequences. Using the figure 7.5 (attached), which amino acid is encoded by each of these sequences, after transcription and translation?

• GAT:
• ATT:
• CGC:
• CCA:

My thought process was the make 5'mRNA3' from the DNA sequences they gave, which gave me....

• GAU
• AUU
• CGC
• CCA

Then I looked at the Codon chart, and got the following answers

• Asparate
• Isoleucine
• Arganine
• Proline

However, the Kaplan answer key says (I also attached a picture of this)

• Isoleucine
• Asparagine
• Alanine
• Trytophan
  • It seems to be that these are the codons from tRNA. But please correct me if I am wrong. I just need a bit of clarification in this subject. Thanks in advance for all your help. I am not understanding where kaplan is getting their aa from.
    
    
    

 

[deleted987519]

5'-GAT-3'
The RNA transcript will be built 5' -> 3' with respect to the RNA, antiparallel to the above DNA
3'---A-5'
3'--UA-5'
3'-CUA-5'

RNA 5'->3': AUC

Your answer checks out IF they tell you the DNA presented is the coding strand.

 

[premedsp]

5'-GAT-3'
The RNA transcript will be built 5' -> 3' with respect to the RNA, antiparallel to the above DNA
3'---A-5'
3'--UA-5'
3'-CUA-5'

RNA 5'->3': AUC

Your answer checks out IF they tell you the DNA presented is the coding strand.

Thank you!!