Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

10. Transcription

Transcription in Prokaryotes

Genetics

10. Transcription

Transcription in Prokaryotes

Previous problemNext problem

Struggling with Genetics?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

What is the purpose of a sigma factor in prokaryotic transcription?

The sigma factor serves as a transcription initiator sequence

The sigma factor controls the specificity of the polymerase

The sigma factor forms the transcription bubble

The sigma factor controls transcription termination

Previous problemNext problem

Verified step by step guidance

Understand the role of sigma factors in prokaryotic transcription: Sigma factors are proteins that bind to RNA polymerase and direct it to specific promoter regions on the DNA, initiating transcription.

Recognize that sigma factors are crucial for transcription initiation: They help RNA polymerase recognize and bind to the correct promoter sequences, ensuring that transcription starts at the right location.

Differentiate between the options given: The sigma factor does not form the transcription bubble or control transcription termination; its primary role is in the initiation phase.

Focus on the specificity aspect: Sigma factors control the specificity of RNA polymerase by guiding it to specific promoters, which is essential for the correct expression of genes.

Conclude with the correct understanding: The sigma factor's main function is to control the specificity of the polymerase, ensuring that transcription is initiated at the correct promoter sites.

1:14m

Watch next

Master Prokaryotic Transcription with a bite sized video explanation from Kylia

Start learning

Related Videos

Related Practice

Open Question

The DNA sequence below gives the first 12 base pairs of the transcribed region of a gene, and the template and nontemplate strands of DNA are identified. The transcription start is the thymine nucleotide at the end of the sequence given. Use the diagram to answer the list of questions. Make a copy of the diagram before you begin answering the questions, or have one group member diagram the answers for bacteria and another group member diagram the answers for eukaryotes.Nontemplate strand ___________TTGCTACGGTCA___________Template strand ___________AACGATGCCAGT___________Write the anticipated bacterial consensus sequence(s) in the approximate position(s) on the diagram.

Open Question

The DNA sequence below gives the first 12 base pairs of the transcribed region of a gene, and the template and nontemplate strands of DNA are identified. The transcription start is the thymine nucleotide at the end of the sequence given. Use the diagram to answer the list of questions. Make a copy of the diagram before you begin answering the questions, or have one group member diagram the answers for bacteria and another group member diagram the answers for eukaryotes.Nontemplate strand ___________TTGCTACGGTCA___________Template strand ___________AACGATGCCAGT___________Assuming the sequence shown is part of a bacterial gene, what consensus sequence(s) would you expect to identify in the promoter?

Open Question

The DNA sequence below gives the first 12 base pairs of the transcribed region of a gene, and the template and nontemplate strands of DNA are identified. The transcription start is the thymine nucleotide at the end of the sequence given. Use the diagram to answer the list of questions. Make a copy of the diagram before you begin answering the questions, or have one group member diagram the answers for bacteria and another group member diagram the answers for eukaryotes.Nontemplate strand ___________TTGCTACGGTCA___________Template strand ___________AACGATGCCAGT___________Assuming the sequence shown is part of a bacterial gene, draw the approximate positions of the promoter sequence and the termination sequence.

Multiple Choice

Which of the following is not an example of a prokaryotic promoter sequence?

Multiple Choice

Prokaryotic transcription can create polycistronic mRNA.

Open Question

The diagram below shows a DNA duplex. The template strand is identified, as is the location of the nucleotide.

Assume this region contains a gene transcribed in a bacterium. Identify the location of promoter consensus sequences and of the transcription termination sequence. <>

Open Question

The DNA sequences shown below are from the promoter regions of six bacterial genes. In each case, the last nucleotide in the sequence (highlighted in blue) is the nucleotide that initiates transcription. Determine the consensus sequence for the Pribnow box from these sequences. <>

Open Question

Bacterial and eukaryotic gene transcripts can differ—in the transcripts themselves, in whether the transcripts are modified before translation, and in how the transcripts are modified. For each of these three areas of contrast, describe what the differences are and why the differences exist.

Show more practices

Transcription in Prokaryotes practice set

Problem sets built by lead tutors

Expert video explanations

Go to Practice

Download the Mobile app

Privacy

Do not sell my personal information

Accessibility

Patent notice

Sitemap