The changes in tryptophan synthase activity when the trp mRNA is stable. Introduction: A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

Question

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Answer 1

Question

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.

Conclusion

Conclusion:

The tryptophan synthase activity will decrease when the trp mRNA and tryptophan synthase are both degraded rapidly.

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Answer 2

Question

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.

Conclusion

Conclusion:

The tryptophan synthase activity will decrease when the trp mRNA and tryptophan synthase are both degraded rapidly.

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Answer 3

Question

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.

Conclusion

Conclusion:

The tryptophan synthase activity will decrease when the trp mRNA and tryptophan synthase are both degraded rapidly.

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

Answer 4

Question

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.

Conclusion

Conclusion:

The tryptophan synthase activity will decrease when the trp mRNA and tryptophan synthase are both degraded rapidly.

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Answer 5

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.

Conclusion

Conclusion:

The tryptophan synthase activity will decrease when the trp mRNA and tryptophan synthase are both degraded rapidly.

Answer 6

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

Answer 7

Chapter 28, Problem 1P

(a)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

Answer 8

(a)

Expert Solution

Explanation of Solution

Explanation:

There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.

The trp mRNA is stable in bacterial cell, even when the tryptophan is present in a medium, producing tryptophan synthase, thus the level of tryptophan synthase enzyme will remain high.

Answer 9

(a)

Expert Solution

Answer 10

(a)

Expert Solution

Answer 11

Expert Solution

Answer 12

Conclusion

Conclusion:

The level of tryptophan synthase activity will remain high in the bacterial cell, when the trp mRNA is stable

Answer 13

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

Answer 14

(b)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA is degraded rapidly, but tryptophan synthase is stable.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

Answer 15

(b)

Expert Solution

Explanation of Solution

Explanation:

The trp A and trp B genes encodes the enzyme tryptophan synthase, in absence of tryptophan in the growth medium. If the trp mRNA is degraded but the tryptophan synthase is stable, the activity of the enzyme will remain high, even in the presence of tryptophan.

Answer 16

(b)

Expert Solution

Answer 17

(b)

Expert Solution

Answer 18

Expert Solution

Answer 19

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.

Conclusion

Conclusion:

The tryptophan synthase activity will decrease when the trp mRNA and tryptophan synthase are both degraded rapidly.

Answer 20

(c)

Summary Introduction

To explain:

The changes in tryptophan synthase activity when the trp mRNA and tryptophan synthase both are degraded rapidly.

Introduction:

A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.

Answer 21

(c)

Expert Solution

Explanation of Solution

Explanation:

An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.

Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The trp A and trp B genes encodes the trp mRNA which produce enzyme tryptophan synthase. When the trp mRNA and tryptophan synthase both are degraded rapidly it prevent the transcription of structural gene by decreasing the enzymatic activity.