Which of the following is a non-sense codon?
Correct answer: A. UGA
- A. UGA
- B. UAU
- C. CAU
- D. GAU
Explanation
Stop codons are also called nonsense codons because they do not code for an amino acid and instead signal the end of protein synthesis. Thus, nonsense mutations occur when a premature nonsense or stop codon is introduced in the DNA sequence.Stop codons (UAA, UAG or UGA) are recognized by release factors which bind into the A-site and use an activated water molecule to hydrolyze the ester linkage between the completed polypeptide and tRNA.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
Practise Cell Structure and Function
2,478 free Cell Structure and Function MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Chromosomes questions
How many nucleotides are in 12 mRNA codons?
The experiments by Hershey and Chase helped confirm that DNA was the hereditary material on the basis of the finding that :
DNA polymerase adds nucleotides to the 3' end of the primer so the direction of replication will be?
If a disorder is not present in a child family but the fetus itself is infected before birth, it is known as:
What will happen if a nucleotide is deleted from a gene having 9 nucleotides in its transcriptional unit?
Identify in which of the following the genetic information is catalyzed using reverse transcription;