Healthy Individuals of Paramecium Bursaria Contain Photosynthetic Algal Endosymbionts of the Genus

question 51

Multiple Choice

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.
-A P. bursaria cell that has lost its zoochlorellae is said to be aposymbiotic. It might be able to replenish its contingent of zoochlorellae by ingesting them without subsequently digesting them. Which of the following situations would be most favourable to the reestablishment of resident zoochlorellae, assuming compatible Chlorella are present in P. bursaria's habitat?

• A) abundant light, no bacterial prey
• B) abundant light, abundant bacterial prey
• C) no light, no bacterial prey
• D) no light, abundant bacterial prey

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Definitions:

Solid Food

Foods that are not liquid or pureed, typically introduced to infants around the age of 6 months to complement breast milk or formula.

Cereal

A type of food made from processed grains, often eaten as a breakfast item, served either hot or cold, and frequently accompanied by milk.

Pureed Vegetables

A food preparation technique where vegetables are blended or mashed to a smooth consistency.

Cephalocaudal

A principle of growth and development where skills emerge from the head down through the body.