1) What is the correct order of elements that comprise a functional protein-enco
ID: 50176 • Letter: 1
Question
1) What is the correct order of elements that comprise a functional protein-encoding gene in a prokaryote?
a) Regulatory region, promoter, transcribed region, terminator
b) Regulatory region, promoter, terminator, transcribed region
c) Promoter, Transcribed region, regulatory region, terminator
2) What site on the ribosome is primarily responsible for holding the growing polypeptide?
a) A
b) P
3) A translocation that moves a gene from an area of euchromatin to heterchromatin would typically cause a(n)_ in the expression of the gene.
a) Reduction
b) Gene expression would remain the same
Explanation / Answer
1. a. Regulatory region, promoter, transcribed region, terminator. regulatory region will regulate the transcription , promoter is the sequence of DNA which will work as a start point for transcription. and the transcribed region will refer to transcript and then terminator will terminate the process.
2. P site is responsible for holding the growing polypeptide , In translation the new peptidyl -tRNA is translocated to the Psite as the ribosome moves exactly three nucleotides along the mRNA molecule , this action relases the uncharged tRNA from P site and transfers the newly formed peptidyl tRNA from A site to the Psite .
3. A. reduction in the expression of genes. ----- because euchromatin is the light stainiing region of chromatinn , this region is transcriptionally active and contains most of the protein encoding genes , heterochromatin is darkly stained that remains condensed and therfore it is transcriptionally silent , therfore when a gene is translocated from euchromatin to heterochromatin the transcription will be silenced.
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