Question

What is the signal sequence?

• A. Is a sequence of DNA that begins transcription
• B. Is a sequence of RNA that is spliced out in the nucleus
• C. Is a sequence of DNA that directs a protein to certain organelles
• D. Is a sequence of DNA that attracts transcription factors
• E. Is the sequence of tRNA that bonds with the codon of mRNA at the ribosome

Answer 1

The correct option is C Is a sequence of DNA that directs a protein to certain organelles

The promoter is the sequence of DNA that determines the site of initiation of transcription and attracts transcription factors. Introns are non coding sequences of hnRNA that are spliced out during post-transcriptional modification in the nucleus. The anticodon loop of tRNA has anticodon triplet at the tip which base pairs with the corresponding codon in mRNA. Signal sequences or uptake-targeting sequences are 20-50 amino acids long sequences of proteins that carry information to target a protein to a particular organelle destination. Thus, the correct answer is option C.