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Chapter 9: Q. 9 (page 250)

A scientist notices that when she adds a small, water soluble molecule to a dish of cells, the cells turn off transcription of a gene. She hypothesizes that the ligand she added binds to a(n) ______ receptor.

a. Intracellular

b. Hormone

c. Enzyme-linked

d. Gated ion channel-linked

Short Answer

Expert verified

The correct answer is (c) Enzyme-linked receptors.

Step by step solution

01

Step 1. Introduction

Ligand is a molecule or atom that irreversibly binds to a receiving protein molecule known as a receptor.

02

Step 2. Intracellular receptors

The ligands of intracellular receptors are small hydrophobic i.e. water-insoluble molecules.

03

Step 3. Hormone receptors

The ligands of hormone receptors are hormones and they are specific for hormones.

04

Step 4. Enzyme-linked receptors 

They are transmembrane proteins and extracellular ligands bind to them on the extracellular side and thus allowing the hydrophilic molecules to pass.

05

Step 5. Gated ion channel-linked receptors 

The ligands binding to gated ion channel linked receptors are specifically ions and not molecules. These ions are usually sodium, magnesium, calcium or hydrogen.

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Most popular questions from this chapter

A scientist notices that a cancer cell line shows high levels of phosphorylated ERK in the absence of EGF. What are two possible explanations for the increase in phosphorylated ERK? Be specific in which proteins are involved.

What is the function of a phosphatase?

a. A phosphatase removes phosphorylated amino acids from proteins.

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a. They are polar.

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