You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of the cytoplasm. It has well-developed organelles and two nuclei, one large and one small. This organism is most likely to be a ________.
A) foraminiferan
B) diatom
C) ciliate
D) dinoflagellate
E) slime mold

Question

Quizplus · Accepted Answer

The presence of well-developed organelles and two nuclei, one large and one small, are characteristic of ciliates. The use of short extensions of the cytoplasm for motility is also a trait of ciliates. Foraminiferans and diatoms are unicellular but are not heterotrophic. Dinoflagellates are unicellular and heterotrophic but typically have one nucleus. Slime molds are heterotrophic but are typically multicellular.

You Are Given an Unknown Organism to Identify