A New Species of Human Gut Bacteria Is Discovered

question 1

Multiple Choice

A new species of human gut bacteria is discovered.Scientists find that during the process of breaking down and utilizing undigested plant fibers,the bacteria also produces a vitamin that is absorbed by humans.The relationship described is an example of

• A) amensalism.
• B) parasitism.
• C) commensalism.
• D) mutualism.

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Definitions:

Calcaneal Tendon

Common tendon of the gastrocnemius, soleus, and plantaris muscle that attaches to the calcaneus; also called Achilles tendon.

Sternocleidomastoid

A muscle in the neck that is responsible for rotation and flexion of the head.

Orbicularis Oculi

A facial muscle that encircles the eye socket, responsible for closing the eyelids.

Masseter

A facial muscle critical for chewing and biting, located at the angle of the jaw.