Final answer:
The correct option is a. The mRNA strand CUAUGUGUCGUAACAGCCGAUGACCCG translates to a sequence of amino acids starting with methionine, followed by cysteine, arginine, asparagine, serine, aspartic acid, aspartic acid, and proline. The chain continues until a stop codon is reached.
Step-by-step explanation:
When a strand of mRNA is translated into a sequence of amino acids, each group of three nucleotides, known as a codon, corresponds to a specific amino acid. The mRNA strand you have provided is CUAUGUGUCGUAACAGCCGAUGACCCG, which must be read from the 5' end and translated into a polypeptide chain. The reading frame is established by the start codon, AUG, which specifies the amino acid methionine. Following the start codon, we group each triplet of bases to read the sequence and determine the corresponding amino acids until a stop codon is reached, signifying the end of translation.
Following the genetic code, the translation of the given mRNA strand will be as follows:
- AUG - Start codon (Methionine)
- UGU - Cysteine
- CGU - Arginine
- AAC - Asparagine
- AGC - Serine
- GAU - Aspartic acid
- GAC - Aspartic acid
- CCG - Proline
The sequence provided ends with 'CCG' which does not indicate a stop codon, thus translation continues if the mRNA sequence is longer.