Question 1

According to fossil evidence, the evolution of eukaryotic cells occurred about _____ years ago.



3.2 to 6.1 million



250 to 500 million



1.2 to 1.5 billion



3.5 to 3.8 billion


1 points  

Question 2

The protists include



heterotrophs.



autotrophs.



both a and b



none of the above


1 points  

Question 3

Which of the following statements describes ciliates?



They have no cell walls.



They are unicellular.



They are heterotrophic.



all of the above


1 points  

Question 4

What do ciliates use small cilia for?



energy



locomotion



reproduction



all of the above


1 points  

Question 5

Euglenoid chloroplasts are surrounded by ______ membranes.



no



four



two



three


1 points  

Question 6

Some autotrophic euglena species become ______ when light levels are low.



inactive



heterotrophic



saprophytic



none of the above


1 points  

Question 7

Red tides release _____ into the ocean.



nutrients



carbon dioxide



oxygen



toxins


1 points  

Question 8

Phylum Amoebozoa traditionally included



amoebas.



radiolarians.



foraminiferans.



all of the above


1 points  

Question 9

_____ are the most numerous unicellular algae in the oceans.



Amoebas



Golden algae



Diatoms



none of the above


1 points  

Question 10

Which of the following have numerous hair-like projections from their flagella?



diatoms



golden algae



water molds



all of the above