In a small stream, you pick up a rock and observe many small, flattened worms crawling on its undersurface. You decide that they belong to the phylum Platyhelminthes. To which class do they probably belong?

#Question id: 11502

#Unit 9. Diversity of Life Forms

Which of these statements is false and therefore does not support the hypothesis that certain eukaryotic organelles originated as bacterial endosymbionts? Such organelles

#Question id: 11503

#Unit 9. Diversity of Life Forms

Which process allowed the nucleomorphs of chlorarachniophytes to be first reduced, and then (in a few species) lost altogether, without the loss of any genetic information?

#Question id: 11504

#Unit 9. Diversity of Life Forms

Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes?

#Question id: 11505

#Unit 9. Diversity of Life Forms

An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival?

#Question id: 11506

#Unit 9. Diversity of Life Forms

A biologist discovers a new unicellullar organism that possesses more than two flagella and two small, but equal-sized, nuclei. The organism has reduced

mitochondria (mitosomes), no chloroplasts, and is anaerobic. To which clade does this organism probably belong?

#Question id: 11507

#Unit 9. Diversity of Life Forms

Which two genera have members that can evade the human immune system by frequently changing their surface proteins?

1.  Plasmodium

2.  Trichomonas

3.  Paramecium

4.  Trypanosoma

5.  Entamoeba