Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 12, Problem 1TY

Genes that are expressed at all times at relatively constant levels are known as _____ genes.

  1. inducible
  2. repressible
  3. positive
  4. constitutive
  5. protein-encoding

Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

Genes are functional units of DNA. Genes carry the hereditary information and pass it from one generation to the next. The availability of genes depends on the location and environment of the cell.

Answer to Problem 1TY

The correct answer is constitutive genes.

Explanation of Solution

Explanation/justification for the correct answer:

Constitutive genes are transcribed continuously in the cell at the constant level like the housekeeping genes transcribe important proteins (actin, GAPDH). These genes are required by all the cells for proper functioning and maintenance of cell.

The explanation for the incorrect answer:

Option A is incorrect.

Inducible genes are expressed in the cell when inducer binds to co-repressor. Inducer presence depends upon the concentration of certain substances in the cell. Thus, this is not the correct answer.

Option B is incorrect.

Repressible genes are expressed only in the presence of co-repressor. Thus, these genes are activated during specific times in the cell. Hence, the option is correct.

Option C is incorrect.

Genes which positively affect the transcription of genes are known as positive genes. Positive genes are not required by each cell. Thus, the option is not correct.

Option E is incorrect.

Protein coding is the process in which the DNA sequence is transcribed into a stretch of a polypeptide. The polypeptide produced through the process may or may not be continuously produced in the cell. Thus, it is incorrect.

Conclusion

The correct answer is d.

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
RNA _________ Causes Gene Inactivation by Destroying the Corresponding mRNA.
Any mutation inside or outside a coding regionthat reduces or abolishes protein activity in one of the manyways previously described is a loss-of-function _______?
The process in which the two-dimensional structure of RNA from the L region of an operon can either prevent or allow transcription of the structural genes is called _____________.  Group of answer choices Activation Co-repression Induction Attenuation Repression
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
  • Text book image
    Nutrition Now
    Health & Nutrition
    ISBN:9781337415408
    Author:Brown
    Publisher:Cengage
Text book image
Nutrition Now
Health & Nutrition
ISBN:9781337415408
Author:Brown
Publisher:Cengage
QCE Biology: Introduction to Gene Expression; Author: Atomi;https://www.youtube.com/watch?v=a7hydUtCIJk;License: Standard YouTube License, CC-BY