Biology
Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Chapter 13, Problem 1TY
Summary Introduction

Introduction: Genes are the segment of DNA that are referred to as a basic functional and physical unit of hereditary. Some genes contain information that helps in the synthesis of proteins.

Expert Solution & Answer
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Answer to Problem 1TY

Correct answer: The constitutive genes are expressed at a relatively constant level at all times. Hence, the correct answer is option d.

Explanation of Solution

Reason for correct answer:

Constitutive genes are also known as housekeeping genes and are required for maintaining the basic cellular functions. Under normal conditions, the constitutive genes are expressed in all the cells of the body at a constant level. The products of constitutive genes support the basic biochemical processes in the cell.

Option d. is given as, “constitutive”.

The genes that are expressed at a relatively constant level at all times are known as constitutive genes. Hence the correct answer is option d.

Reasons for incorrect answer:

Option a. is given as, “inducible”.

Inducible genes are also known as facultative genes, and are only needed as an opposition to a constitutive gene. Hence, option a. is incorrect.

Option b. is given as, “repressible”.

Repressible genes are only required during the growth and maintenance of cell. Hence, option b. is incorrect.

Option c. is given as, “positive”.

Positive genes are not present in the cells of an organism. Hence, option c. is incorrect.

Option e. is given as, “structural”.

Structural genes help in the construction of cellular structures like organelles and membrane. The RNA products of structural genes are not involved in the regulation of the cell. Hence, option e. is incorrect.

Hence, the options a., b., c., and e. are incorrect.

Conclusion

At relatively constant levels, the constitutive genes are expressed at all times.

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