Question

transition of the dna sequence aagctggga would result in
a an mrna strand with the sequence ttcgaccct
b a dna strand with the base sequence ttcgaccct
c an mrna strand with the sequence uugcacccu
d a sequence of three amino acids linked by peptide bonds

Explanation:

1. Recall base - pairing rules in DNA and RNA. In DNA, A pairs with T and G pairs with C. When transcribing DNA to mRNA, T in DNA is replaced by U in mRNA.
2. Analyze each option:

• Option A: mRNA does not have T (thymine), it has U (uracil), so this option is incorrect.
• Option B: A transition in DNA would result in a complementary DNA strand during replication following base - pairing rules (A - T, G - C). The given sequence TTCGACCCT is the complementary strand of AAGCTGGGA in DNA.
• Option C: The given mRNA sequence UUGCACCCU does not follow the correct base - pairing for transcribing AAGCTGGGA.
• Option D: Just a DNA sequence transition doesn't directly result in a sequence of amino acids linked by peptide bonds without transcription and translation processes.

Answer:

B. a DNA strand with the base sequence TTCGACCCT