D1.2 Protein synthesis (Molecules)：練習問題

Which of the following correctly identifies the cellular location and the primary product of translation in a eukaryotic cell?

During protein synthesis, a specific tRNA molecule has the anticodon sequence 5'-GCA-3'. Which of the following identifies the corresponding mRNA codon and the DNA triplet on the coding (sense) strand?

During the elongation stage of translation, a tRNA molecule enters the ribosome at the A site. If the mRNA codon being read is 5'-GCA-3', which of the following identifies the correct anticodon on the tRNA and the amino acid it carries, assuming standard base pairing?

The genetic code is generally considered universal, but some exceptions exist. Despite these minor variations, which codon almost universally serves as the start codon for translation and codes for methionine in eukaryotes?

In a eukaryotic cell, a specific gene is constitutively expressed, meaning it is always transcribed and translated. Which of the following scenarios would be least likely to significantly impact the consistent production of the protein encoded by this gene?

Distinguish between the roles of the large and small ribosomal subunits during the initiation and elongation phases of translation.

Explain how the degeneracy of the genetic code is advantageous for an organism.

Describe the role of codons and anticodons during translation.

Describe the processes of transcription and translation in eukaryotic cells, highlighting the key enzymes, molecules, and cellular locations involved in each stage. Explain how the genetic code ensures the correct sequence of amino acids in a polypeptide chain.

Include a discussion on the role of post-transcriptional modifications, such as splicing, in eukaryotes and how they contribute to protein diversity.