BuyFind

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
Publisher: CENGAGE L
ISBN: 9781305967359
BuyFind

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
Publisher: CENGAGE L
ISBN: 9781305967359

Solutions

Chapter 31, Problem 1SA
Summary Introduction

Introduction:

The process by which mRNA is synthesized from DNA is known as transcription. This process takes place inside the nucleus of the cell. It is regulated by various factors and hormones.

Expert Solution

Answer to Problem 1SA

Correct answer:

The steroid hormones enter into cells and function as a transcription factor. Hence, the correct answer is option a.

Explanation of Solution

Reason for correct answer:

Option a. is given as “steroid.”

The steroid hormones are synthesized from cholesterol. A steroid hormone is a non-polar molecule that does not dissolve in water. These hormones travel through the blood and reach their target molecule. The dissolve in lipids, as a result, they diffuse across the cell membrane and binds with receptor forming a hormone-receptor complex. Steroid hormone binds with the promoter of DNA and alters the rate of transcription.

Reason for incorrect answer:

Option b. is given as, “protein.”

Protein hormones are water-soluble hormone and cannot act on the surface of the target cell. Hence, option b. is incorrect.

Option c. is given as, “peptide.”

Peptide hormones are also known as protein hormones. They cannot act on the surface of the target cell. Hence, option c. is incorrect.

Option d. is given as, “both b and c.”

Protein hormones or peptide hormones are water-soluble hormones, so they cannot reach the target cell with the help of blood. Hence, option d. is incorrect.

Hence, the options b., c., and d. are incorrect.

Conclusion

The steroid hormones enter into cells and work as a transcription factor. Thus, the correct option is a.

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