A tRNA has as its anticodon 3\' CGA 5\'. What amino acid does it carry? Arg gln

Question

A tRNA has as its anticodon 3' CGA 5'. What amino acid does it carry? Arg gln ala asp ser All the following are true concerning polycistronic messages EXCEPT they Are usually found in eukaryotes Are pieces of mRNA that carries the codes for several proteins Are often found in bacteria Have polyribosomes attached to them Are often transcripts of operons What is a "degenerate" code? A code in which more than one codon can code for a single amino acid A code in which one codon can code for more than one amino acid A code which, over evolutionary time, has picked up too many mutations for the code to be useful A code that is no longer universal, because many organisms use a code that differs in some codons The code that has been transcribed into an mRNA that is being degraded The wobble hypothesis would predict that molecules of tRNA that contain which of these anticodons could pair with the codon 5' ACG 3'? 3' UGU 5' 3' UGG 5' 3' AGU 5' 3' AGC 5*

Explanation / Answer

31) CGA codes for Arginine (Arg).

32) True cistronic messages are associated with (prokaryotes) bacteria not eukaryotes. So, the answer is (A).

33) "Degenerate" code is one which refers to a code in which more than one codon can code for one amino acid. So, the answer is (A).

34) According to the wobble hypothesis, the base in first position of anti-codon on tRNA is usually an abnormal, like inosine pseudouridine etc. these abnormal bases are able to pair with more than one type nitrogenous base in the third position of the codon on mRNA. If A is at the third position it base pairs with U or I, likewise U with A, G or I, G with C or U, C with G or I.

So, molecules of tRNA that contain 3' UGU 5' anticodon could pair with codon 5' ACG 3'. Hence, the answer is (A).

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