MCQ
Which of the following is a stop codon?
- AAUG, GUG, UUU
- BUGA, UAG, UAA
- CUUU, UAC, CUC
- DCUC, UAC, UAA
Explanation:
Termination of chain growth in protein synthesis is brought about by UAA, UAG, UGA.
Translation starts with a chain initiation codon or start codon and terminates with a stop codon. The three stop codons have been given names - UAG is amber, UGA is opal, and UAA is ochre.
Stop codons are also called "termination" or "nonsense" codons.
They signal the release of the nascent polypeptide from the ribosome because there is no cognate tRNA that has anticodons complementary to these stop signals, and so a release factor binds to the ribosome instead.
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$A$. The piece of $DNA$ would be able to multiply itself independently in the progeny cells of the organism.
$B$. It may get integrated into the genome of the recipient.
$C$. It may multiply and be inherited along with the host $DNA$.
$D$. The alien piece of DNA is not an integral part of chromosome.
$E$. It shows ability to replicate.
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