Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans?

A. Myxomycota
B. Choanoflagellates
C. Ciliates
D. Radiolarians
E. Rhodophyta


Answer: B

Biology & Microbiology

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If goats are crossed with sheep, embryos will form but cease development and spontaneously abort. This is an example of

A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. spermatic behavior.

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When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side, what happened to the seedling?  

A.  It bent away from the directional light. B.  It did not respond to the directional light. C.  It grew toward the light, as expected. D.  It waved back and forth. E.  It wilted and died.

Biology & Microbiology

Four of the five terms listed below are used to

describe a neuron cell membrane. Select the exception. a. gated channels b. pumps c. wave of depolarization d. open channels e. synaptic cleft

Biology & Microbiology

DNA is synthesized in which stage of the typical cell cycle? 

A. prophase B. G1 C. S D. G2

Biology & Microbiology