AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In DNA transcription, the following segment of DNA would have which complementary segment of mRNA:CGTACTTGATCA
A
GCAUGAACUAGU
B
CGTACTTGATCA
C
Both are incorrect
Explanation: 

Detailed explanation-1: -The lower strand is the strand that is complementary to the mRNA. The-35 region (TTGACA) and-10 region (TATATT) of the promoter sequence and the transcriptional start site (the A) is indicated on the coding strand.

Detailed explanation-2: -The complementary DNA strand of the sequence ATGC will be TACG.

Detailed explanation-3: -Expert-Verified Answer The synthesised mRNA will have base sequence complementary to the template strand of the DNA. This complementarity is useful for synthesis of correct sequence of amino acids. Hence, for the given DNA sequence-‘C-A-A-G-G-T’, the correct mRNA sequence will be ‘G-U-U-C-C-A’.

Detailed explanation-4: -The tRNA anticodon is a sequence of three nucleotides that are the complement of the three nucleotides in the mRNA codon. The function of the anticodon is to help the tRNA find the appropriate amino acid that the mRNA codon specified.

There is 1 question to complete.