Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
Question
Chose the false statement
Transcribed Image Text:### Transcription and Explanation for Educational Website
**Diagram Explanation:**
The image illustrates the regulation of gene expression in the lactose operon (lac operon) system in prokaryotes, specifically bacteria.
- **DNA Structure:**
- The diagram shows a segment of DNA with components labeled: regulatory gene (lacI), promoter, operator, and structural gene (lacZ).
- The **regulatory gene (lacI)** produces an active repressor protein.
- The **promoter** is the region where RNA polymerase binds to initiate transcription.
- The **operator** is a DNA segment that an active repressor can bind to prevent transcription.
- The **structural gene (lacZ)** is the gene of interest whose transcription is controlled.
- **Gene Expression Process:**
- Transcription of the gene is initiated by RNA polymerase when it binds to the promoter.
- If the active repressor protein binds to the operator, transcription is blocked, and "No RNA made" is indicated.
- This blockage prevents the production of mRNA and subsequently, the protein encoded by lacZ.
- **Repressor Protein:**
- The diagram shows the formation of an "Active repressor" which can bind to the operator and inhibit transcription.
**Quiz Questions and Options:**
1. The presence of lactose could alter the structure of such a repressor protein, thus turning the gene ON.
2. This is an operon system that is ON most of the time, except when its repressor is activated.
3. The regulatory gene is continuously producing repressor protein.
4. The gene products of this operon are involved in a catabolic process.
The lac operon system is an example of gene regulation where the operon is typically off when the repressor is active. Lactose can inactivate the repressor, allowing gene transcription.
Transcribed Image Text:**Question 22**
Describe the structure of a ribosome including its composition, and its various binding sites. Describe how it functions in the elongation cycle and recognize the value of antibiotics that target this structure. (3 points)
There are no graphs or diagrams in the image.
Expert Solution
Step 1
The lac operon is an operon, or group of genes with a single promoter (transcribed as a single mRNA). It contains regulatory gene, operator gene promoter gene and structural genes.
Step by step
Solved in 2 steps
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:
9780134580999
Author:
Elaine N. Marieb, Katja N. Hoehn
Publisher:
PEARSON
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Anatomy & Physiology
Biology
ISBN:
9781259398629
Author:
McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:
Mcgraw Hill Education,
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:
9780134580999
Author:
Elaine N. Marieb, Katja N. Hoehn
Publisher:
PEARSON
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Anatomy & Physiology
Biology
ISBN:
9781259398629
Author:
McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:
Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:
9780815344322
Author:
Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:
W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:
9781260159363
Author:
Martin, Terry R., Prentice-craver, Cynthia
Publisher:
McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Biology
ISBN:
9781260231700
Author:
Sylvia S. Mader, Michael Windelspecht
Publisher:
McGraw Hill Education