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Tragedy of the commons
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CC BY-NC-SA
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The tragedy of the commons occurs when goods are rival but not excludable. In this video, we explore the intuition, and consequences, behind such goods. Created by Sal Khan.

Subject:
Economics
Social Science
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/27/2021
Trp operon
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The trp operon is a well-studied operon when it comes to gene regulation. It is involved in the biosynthesis of the amino acid tryptophan.

Subject:
Biology
Life Science
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
06/23/2016
Types of competition and marginal revenue
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CC BY-NC-SA
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In imperfect competition, firms have some control over the price they charge, so the individual firm's demand curve is not horizontal. Learn how that fact also changes the marginal revenue curve in this video.

Subject:
Economics
Social Science
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/27/2021
Types of immune responses: Innate and adaptive, humoral vs. cell-mediated
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Innate vs. adaptive immunity. Humoral adaptive immunity vs. cell-mediated adaptive immunity. Created by Sal Khan.

Subject:
Anatomy/Physiology
Applied Science
Biology
Health, Medicine and Nursing
Life Science
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
02/18/2010