Algae
Which algal division never produces motile, flagellated cells among any of its members?

Chrysophyta
Phaeophyta
Chlorophyta
Rhodophyta

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Algae
Which of the following best describes the algae known as diatoms?

Cells are encased in rigid walls composed of cellulose coated with silicon
Cells contain carotenoid pigments as well as chlorophyll A and B
Cells have intricate shells of silicon dioxide with two halves
Cells have flagella and a light-detecting eye spot

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