FIRST: Only answer if experienced in this field, no counter-questions, "I used to take this but I forgot," or random link-posting.
A triplet of bases in a template strand of DNA is 5' CAG 3'. What would be the corresponding codon for mRNA?
A) 3' GTC 5'
B) 3' GUC 5'
C) 5' GTC 3'
D) 5' GUC 3'
I think it is either answer choice B or C.
*answer choice B or D
So I'm the only AP Bio student/teacher here?
5' CAG '3 is the template strand which is the anti sense strand and thus, the non coding strand. The compliment to that strand is the non template strand which is the sense strand and thus, the coding strand. That strand is 3' GTC '5.
The 3' GTC '5 is what is transcribed into a mRNA transcript 5' CAG '3.
To determine the corresponding codon for mRNA in this scenario, we need to understand the concept of base pairing in DNA and RNA.
In DNA, the bases adenine (A), cytosine (C), guanine (G), and thymine (T) are used. However, when DNA is transcribed into mRNA, the base thymine is replaced with uracil (U). So, in RNA, adenine pairs with uracil (A-U), cytosine pairs with guanine (C-G), and guanine pairs with cytosine (G-C).
In the given DNA template strand, the triplet of bases is "CAG." To find the corresponding codon for mRNA, we need to replace each base with its complementary base.
For the first base, C (cytosine), we replace it with its complementary base, G (guanine).
For the second base, A (adenine), we replace it with its complementary base, U (uracil).
For the third base, G (guanine), we replace it with its complementary base, C (cytosine).
Putting it all together, the corresponding codon for mRNA is 5' GUC 3', as each base in the DNA triplet has been replaced with its complementary base.
Therefore, the correct answer is B) 3' GUC 5'.