Which of the following are termination codons?

UAA, UAG and UGA

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GUG, GCG and GAA

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CCU, CAA and CUA

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CUC, CUA and CUG

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Solution

The correct option is A UAA, UAG and UGA
Triplets UAA, UGA and UAG are stop codons that cause termination of protein synthesis and does not code for any amino acid. In option B, GUG code for valine; GCG codes for alanine and GAA codes for glutamic acid. In option C, CCU code for proline; CAA code for glutamine and CUA code for leucine. In option D, CUC, CUA and CUG code for leucine. Hence, all triplets given in option A are termination codons.
Thus, the correct answer is option A.

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Question 18
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
(i) $Na$
(ii) $Ca$
(iii) $Fe$
(iv) $Cu$

(a) (i) and (iv)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (i) and (ii)

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