The Living Unicellular Group Most Closely Related to Multicellular Animals

question 6

Multiple Choice

The living unicellular group most closely related to multicellular animals is

• A) Filastereans
• B) Choanoflagellates
• C) Ichthyosporeans
• D) Fungi

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Definitions:

Ampulla

A dilated portion of a canal or duct, such as those found in the gastrointestinal and reproductive tracts, which often plays a role in the storage of bodily fluids.

Infundibulum

Funnel-shaped structure or passage—for example, the infundibulum that attaches the hypophysis to the hypothalamus or the funnel-like expansion of the uterine tube near the ovary.

Isthmus

Constriction connecting two larger parts of an organ, such as the constriction between the body and the cervix of the uterus or the portion of the uterine tube between the ampulla and the uterus.

Fimbriae

Short, hair-like structures on the surface of some cells that help in attachment to other cells or surfaces.