Anam Fatma posted an Question
January 11, 2022 • 13:04 pm 15 points
  • IIT JAM
  • Biotechnology (BT)

. an open reading frame of 720 nucleotides codes for a protein consisting of (1) 240 amino acids (2) 239 amino acids (3) 238 amino acids (4) 720 amino acids

. An open reading frame of 720 nucleotides codes for a protein consisting of (1) 240 amino acids (2) 239 amino acids (3) 238 amino acids (4) 720 amino acids

1 Answer(s) Answer Now
  • 0 Likes
  • 6 Comments
  • 0 Shares
  • Mohanchaitanya reddy

    @Anam fatma, they might have been some mistakes, because if you consider the stop codon in a open reading frame that's translated into amino acids, that would be incorrect. as I mentioned earlier "An open reading frame, when translated into Amino acids, there will be no stop codons". Therefore the correct answer would option (1).

  • Mohanchaitanya reddy

    Hello, Correct answer would be option (1). An Open Reading Frame, when translated into amino acids, there will be no stop codons. Therefore, considering that there are no stop codons in those 720 nucleotides, and as each amino acid is coded by three nucleotides (triplet codon), 720 nucleotides (including the start codon which codes for Methionine) will code for 240 Amino acids. 720÷3 = 240. Hope this answers your question. If there is any doubt in this. Please reply back. Happy to help you. Note: I cited the definition of Open reading frame from "https://www.genome.gov/genetics-glossary/Open-Reading-Frame".

    eduncle-logo-app

    answer is 239

    eduncle-logo-app

    It is may be because they have considered the stop codon too. But as I Mentioned an open reading frame, when translated into amino acids does not include stop codon.

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers