Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

A ________ is synthesized from cholesterol and can diffuse across the plasma membrane.

  1. a. steroid hormone
  2. b. protein hormone
  3. c. peptide hormone
  4. d. hormone receptor

Summary Introduction

Introduction: Hormones are the chemical or organic substance secreted by glands that act as messengers in the body. These messengers perform major roles in many body functions.

There are many types of hormones performing different functions in our body. One such hormone is steroid hormones. Steroid hormones are the sex hormones that are biochemically modified form of cholesterol molecule produced in an individual for the development of female or male characteristics. Examples of steroid hormones are androgen and estrogen.


Reason for the correct answer:

The steroid hormone is a cholesterol-derived hormone that has non-polar and lipid soluble nature. They are lipophilic hormones and have lipid solubility that makes them able to diffuse across the nuclear membrane, plasma membrane and cell wall.

Reasons for the incorrect answers:

Option b. is given as “Protein hormone”.

This is incorrect because protein hormones are not derived from the cholesterol but are made from amino acid units and also cannot pass across plasma membrane. They are water-soluble hormones but not fat soluble hormones.

Hence, option b...

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