codons????

Question

how do anitcodons differ from mRNA codons. how do the anticodons differ from DNA?

Answer 1

Anticodon is almost same as DNA codon, just replace U with T. Anticodons are complementary to mRNA codons.

Answer 2

Well, we can go step by step. RNAP makes an RNA copy of the DNA coding strand. So the RNA copy corresponds to the non-coding strand of the DNA. A codon is a group of 3 RNA base pairs. How do you figure out where to start? Well, it's rather complex, but to simplify it... there's an AUG codon at the beginning of the mRNA that codes for methionine. This the very first amino acid of any protein. Anticodons are present on the tRNA which are actually mRNAs that do look like a t that are loaded with an amino acid on the end of them. The anticodon is complimentary to the mRNA. This is how ribosomes select the proper tRNA loaded with the proper amino acid... so that they can make the proteins.
The non-coding strand has the same sequence as the mRNA, with the exception that the mRNA has a U instead of T. The coding strand of DNA will correspond to the anticodons with once again the exception that for the tRNA, it will have Us instead of Ts. Codons and anticodons, (except for very rare cases in some mutations in certain bacteria) are in groups of 3. The mRNA coding sequence can be broken down into groups of 3 RNA bases... starting with like I said above AUG, and ending with one of 3 different "stop" sequences. Each tRNA is made out of a huge sequence of RNA, but only 3 RNAs from the "anticodon loop" actually interact with the mRNA. I hope that this wasn't too confusing and that this helps.

Answer 3

Transfer RNA (tRNA) contains a 3 base unit called an anticodon. This can base pair to a corresponding codon on the mRNA. If a mRNA reads UCU it will pair with the leucine tRNA anti codon
For each gene the DNA strand has a template and a nontemplate strand. RNA codons corresponds to the template codons, ie their bases pair A to U & G to C.
mRNA then correspondes to the tRNA putting it back to U to A & C to G from the original template. This preserves the sequence in the two steps transcription to translation.

DNA template reads 3'TCG5' so mRNA reads 5'AGC3' then the tRNA reads 5'GCU3'-alanine

mRNA AUG to anti codon UAC-MET