Question

Refer to the illustration. Suppose that you are given a protein containing the following sequence of amino acids: tyrosine, proline, aspartic acid, isoleucine, and cysteine. Use the portion of the genetic code given to determine which of the following contains a DNA se-quence that codes for this amino acid sequence
A) GCAAACTCGCGCGTA
B) ATGGGTCTATATACG
C) ATAGGGCTTTAAACA
D) AUGGGUCUAUAUACG

Answer 1

oh cmon. you can do this. just look at the sequence 3-bases at a time and put it together from the table. a six-year-old who can barely recognize the letters can do this. gogo.

Answer 2

Seriously?!?! You need to stop offending people! I'm asking because I didn't get it when my teacher was trying to explain it, not because I don't want to do the work. I am genuinely confused and if you aren't willing to talk to me like a human with feelings then I really do not want your help!

Answer 3

@Schleifspur

Answer 4

okay. look at the table. for each of your amino acids (right column), there is a code of three nucleotides (left column) on the mRNA.

now. you take the first three nucleotides from your possible answers, and try to find them in the left column of the table. you then look in the same row of the table and see which amino acid is written there. if it matches your task (first one should be tyrosine), then look and nucleotides 4-6, repeat the steps.

got it?

Answer 5

oh, I forgot something.

they want you to look for the DNA that encodes the mRNA. now, as you know, the transcription process produces the exact opposite sequence. from GAGTCG, it will make CUCUGC, since G binds to C and A binds to U. so you first have to transcribe your DNA sequences.

don't bother with D, it's false.

Answer 6

I have done it for answer A:

GCAAACTCGCGCGTA in DNA is
CGUUUGAGCGCGCAU in RNA

Answer 7

Okay I think I get it now. Will try to solve it and see if I'm right

Answer 8

@Schleifspur So correct me if I'm wrong but I got for B) uacccagauauaugc and for C) I got uaucccgaaauuugu. I think it's C but I'm still not sure.

Answer 9

correct! :)

Answer 10

very good. you have it in you =)

Answer 11

Actually it was wrong...Got marked wrong o my test

Answer 12

@Schleifspur

Answer 13

ok lemme check.

I did a mistake here. I actually only checked the first two amino acids.

D is the right answer. I will tell you why soon

Answer 14

AUGGGUCUAUAUACG translates into
UACCCAGAUAUAUGC

consulting the table:

UAC - tyrosine
CCA - proline
GAU - aspartic acid
AUA - isoleucine
UGC - cysteine

now, why did I tell you before that D can be ruled out? because the sequence given in D is not DNA, but RNA. uracil (U) does not show up in DNA sequences. this is why I ruled it out. as it turns out though, D is the only sequence that codes for the amino acid sequence. but it is not DNA, so it is not the right answer, technically.

do you have anyone to complain to? sorry I didn't check earlier. my bad :(

Answer 15

the answer that you chose, C:

ATAGGGCTTTAAACA translates into
UAUCCCGAAAUUUGU

UAU - tyrosine
CCC - proline
GAA - glutamic acid :-(
AUU - isoleucine
UGU - cysteine

Answer 16

BUT: C was almost right :)

Answer 17

@schleifspur Okay thanks for explaining to me. Appreciate it. :)