Use the Following Information to Answer the Question

question 1

Multiple Choice

Use the following information to answer the question.
Healthy individuals of Paramecium bursaria contain photosynthetic algal endosymbionts of the genus Chlorella. When within their hosts, the algae are referred to as zoochlorellae. In aquaria with light coming from only one side, P. bursaria gather at the well-lit side, whereas other species of Paramecium gather at the opposite side. The zoochlorellae provide their hosts with glucose and oxygen, and P. bursaria provides its zoochlorellae with protection and motility. P. bursaria can lose its zoochlorellae in two ways: (1) if kept in darkness, the algae will die; and (2) if prey items (mostly bacteria) are absent from its habitat, P. bursaria will digest its zoochlorellae.
Which of the following experimental results would suggest that the zoochlorellae and P. bursaria are mutualists?

• A) The reproductive rate of P. bursaria is higher with zoochlorellae than without.
• B) The mortality rate of P. bursaria is higher with zoochlorellae than without.
• C) Zoochlorellae reproduce more slowly than free-living Chlorella.
• D) The swimming speed of P. bursaria is higher with zoochlorellae than without.

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Definitions:

Horizontal Price-fixing

An illegal agreement between competitors to set prices at a certain level, rather than allowing them to be determined by market forces.

Antitrust Legislation

Laws designed to protect consumers and ensure fair competition in the marketplace by regulating anti-competitive conduct and monopolies.

Lawful

That which is permitted by law; adhering to legal statutes and regulations.

Concerted Action

A collaborative effort by two or more parties to achieve a specific goal, often used in labor disputes.