The -10 and -35 regions of prokaryotic promoters are called consensus sequences because ________. a. they are identical in all bacterial species b. they are similar in all bacterial species c. they exist in all organisms d. they have the same function in all organisms

Short Answer

Expert verified

Option b is correct.

Step by step solution

01

Step 1. Introduction

Prokaryotic promoters are the regulatory sequences that start the transcription of prokaryotic genes. The promoters in prokaryotes consist of two short sequences of -10 and -35 positions upstream from the start site of transcription.

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Step 2. Explanation of the correct option

Option b is correct because consensus sequence refers to the DNA, RNA, or protein sequences that repeat aligned repeated sequences.

Prokaryotic promoters are the regulatory sequences that start the transcription of prokaryotic genes. The promoter element lies at -10 and -35 positions or 10 and 35bp, upstream of where transcription would start.

10 sequence has the consensus because it important recognition site interacting with the alpha factor of RNA polymerase and 35 sequences has the consensus TTGACA which is important in unwinding DNA during transcriptional initiation.

They are similar in all prokaryotes or bacterial species.

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Step 3. Explanation of the incorrect option

Option a is incorrect because they are similar in all prokaryotes or bacterial species.
Option c is incorrect because they exist in prokaryotes only.
Option d is incorrect because they are similar in all prokaryotes or bacterial species.

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