Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 10, Problem 2SQ
Textbook Problem

Binding or ___ to ___ in DNA can increase the rate of transcription of specific genes.

  1. a. activators; repressors
  2. b. activators; enhancers
  3. c. repressors: operators
  4. d. repressors: enhancers

Summary Introduction

Introduction: Transcription is the opening step of protein synthesis where a DNA sequence from a gene is copied to make RNA strand. The rate of the transcription is maintained by certain molecules present in each cell. Those regulatory molecules include activators and repressors that are together called as transcription factors. The activators enhance, whereas the repressors diminish the transcription process.

Explanation of Solution

Reason for the correct statement:

Regulatory molecules such as activators and repressors help to maintain the rate of transcription. Activator plays the role to increasing the rapidity of the transcription process. Enhancers are the sequences present in the DNA of a particular gene to which the activators bind to catalyze the synthesis of the RNA strand (transcription).

Option b. is given as “activators; enhancers”.

To fasten the rate of transcription reaction, the binding of activators to the enhancers in DNA is obligatory. Hence, the correct answer is option b.

Reasons for the incorrect statements:

Option a. is given as “activators; repressors”.

Both activators (speeds up) and repressors (slows down) are the transcription factors or molecules. These factors should bind either to the promoter or to the enhancer region present in the DNA sequence for regulatory action...

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