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

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

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Algae
Number of flagella produced by motile cells in

members of the phaeophyta is greater than members of the Oomycota
None of these
members of the Oomycota is greater than members of the Phaeophyta
members of the Phaeophyta is approximately equal to members of the Oomycota

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