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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Please I need help understanding this question
Transcribed Image Text:**Question:**
Which of the following molecules can act on receptors inside the target cell that directly activate specific genes?
- O melanin
- O melatonin
- O calcitonin
- O estrogen
- O ACTH
**Explanation:**
This question asks which molecule can bind to intracellular receptors to directly activate specific genes. Molecules that interact with intracellular receptors typically have the ability to cross the cell membrane. Estrogen is a steroid hormone known to interact with intracellular receptors and directly influence gene expression by acting on specific regions of DNA.
Expert Solution
Step 1
The endocrine system consists of endocrine glands which pour their secretion i.e hormones directly into the blood. The hormones are receptor-specific.
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