Peptide Hormones

question 212

Multiple Choice

Peptide hormones

• A)are synthesized from modified cholesterol molecules
• B)are typically not bound to plasma proteins in the blood
• C)bind to intracellular receptors at their target cells
• D)typically activate genes to cause the synthesis of new protein molecules
• E)have characteristics c and d

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Definitions:

Annelids

A phylum of invertebrate worms characterized by segmented bodies and often found in wet environments.

Hemoglobin

A protein found in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.

Oxygen-Transporting Pigment

Molecules, such as hemoglobin in vertebrates, responsible for carrying oxygen from the respiratory organs to the rest of the body.

Hemocyanin

A copper-containing oxygen-transport protein found in the blood of some invertebrates, similar in function to hemoglobin in vertebrates.