If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then A. the amino acid inactivates the repressor. B. the repressor is active in the absence of the amino acid. C. the amino acid acts as a corepressor. D. the amino acid turns on transcription of the operon.

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 15, Problem 1TYU

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

A. the amino acid inactivates the repressor.
B. the repressor is active in the absence of the amino acid.
C. the amino acid acts as a corepressor.
D. the amino acid turns on transcription of the operon.

Expert Solution & Answer

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Students have asked these similar questions

1. In vivo testing provides valuable insight into a drug’s kinetics. Assessing drug kinetics following multiple different routes of administration provides greater insight than just a single route of administration alone. The following data was collected in 250 g rats following bolus iv, oral (po), and intraperitoneal (ip) administration.Using this data and set of graphs, determine: (a) k, C0, V, and AUC* for the bolus iv data (b) k, ka, B1, and AUC* for the po data (c) k, ka, B1, and AUC* for the ip data (d) relative bioavailability for po vs ip, Fpo/Fip (e) absolute po bioavailability, (f)Fpo absolute ip bioavailability, Fip MAKE SURE ANSWERS HAVE UNITS if appropriate. SHOW ALL WORK, including equation used, variables used and each step to your solution.

2. Drug quantification from plasma is commonly performed by using techniques such as HPLC or LC/MS. However, these methods do have limitations, and investigators may choose to use a radiolabeled analog of a drug instead. Radioligands are molecules that contain radioactive isotopes, commonly 3H or 14C. This technique allows investigators to quantify drug concentration from radiation measurements. The following measurements were made in 250 g rats following oral administration of 18.2 µCi of a 14C-labeled drug of interest: Time (min) Plasma Radiation Levels (µCi/L) 0 0.0 2 9.7 4 19.2 7 25.3 9 37.8 12 39.6 14 45.8 17 48.8 20 52.0 25 56.4 30 59.2 35 60.1 40 61.1 45 62.1 50 62.8 60 63.1 70 62.1 80 60.1 90 57.3 100 55.5 110 53.7 120 52.2 150 48.0 180 45.0 240 39.0 Note that a µCi is a measure of the amount of radioactivity and hence is a measure of the amount of drug present. Given that the oral bioavailability of this drug is known to be essentially 100%, estimate the following from this…

The current nutrition labelling regulation in Hong Kong requires food manufacturer to list E+7 information on the package of pre-packaged food products. Do you think that more nutrients, such as calcium and cholesterol, shall be included?

Answer 2

Textbook Question

Chapter 15, Problem 1TYU

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

A. the amino acid inactivates the repressor.
B. the repressor is active in the absence of the amino acid.
C. the amino acid acts as a corepressor.
D. the amino acid turns on transcription of the operon.

Expert Solution & Answer

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 15, Problem 1TYU

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

A. the amino acid inactivates the repressor.
B. the repressor is active in the absence of the amino acid.
C. the amino acid acts as a corepressor.
D. the amino acid turns on transcription of the operon.

Expert Solution & Answer

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 15, Problem 1TYU

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

A. the amino acid inactivates the repressor.
B. the repressor is active in the absence of the amino acid.
C. the amino acid acts as a corepressor.
D. the amino acid turns on transcription of the operon.

Expert Solution & Answer

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Answer 8

Expert Solution & Answer

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

Answer 12

Answer to Problem 1TYU

Correct answer:

If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule. Therefore, option (C) is correct.

Answer 13

Explanation of Solution

Reason for the correct statement:

A Trp operon is a group of genes, which encodes certain enzymes (biosynthetic) for tryptophan. This is expressed when the levels of tryptophan is low. An operon that encodes certain enzymes for the formation of amino acids and acts like a Trp operon, then, the amino acids will act like a corepressor. A corepressor is a small molecule that cooperates with the repressor protein for switching the operon off.

Option (C) is given as “the amino acid acts as a corepressor”.

“If a particular operon encodes certain enzymes for forming an amino acid and is regulated as Trp operon, then the amino acid will be acting like a corepressor molecule”, it is the right answer.

Hence, the option (C) is correct.

Reasons for the incorrect statements:

Option (A) is given as “the amino acid inactivates the repressor”.

The amino acid will be acting like a corepressor, hence it will not inactivate the repressor, and however it will react with the repressor. So, it is a wrong answer.

Option (B) is given as “the repressor is active in the absence amino acid”.

If the operon has to be kept ON, then the repressor will be inactive in the absence of amino acid. So, it is a wrong answer.

Option (D) is given as “the amino acid turns on the transcription of operon”.

The amino acid is not responsible for turning the transcription ON. So, it is a wrong answer.

Hence, options (A), (B), and (D) are incorrect.

Answer 14

Conclusion

The amino acid will be acting like a corepressor molecule as if a particular operon encodes certain enzymes for forming an amino acid and is regulated as the Trp operon.

Answer 15

Ch. 15.1 - How does binding of the trp corepressor to its...Ch. 15.1 - Describe the binding of RNA polymerase,...Ch. 15.1 - WHAT IF? A certain mutation in E. coli changes the...Ch. 15.2 - Prob. 1CC Ch. 15.2 - Compare the roles of general and specific...Ch. 15.2 - Prob. 3CC Ch. 15.3 - WHAT IF? Suppose the mRNA being degraded in Figure...Ch. 15.3 - MAKE CONNECTIONS Inactivation of one of the X...Ch. 15.4 - Prob. 1CC Ch. 15.4 - WHAT IF? Study the microarray in Figure 15.17. If...

Concept explainers

Videos

Answer to Problem 1TYU

Explanation of Solution

Want to see more full solutions like this?

Chapter 15 Solutions

Additional Science Textbook Solutions