Algae
Which algal division is divided up into three main groups consisting of the golden-brown algae, the yellow-green algae and the diatoms?

Chrysophyta
Pyrrophyta
Phaeophyta
Chlorophyta

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

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

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Algae
Number of flagella produced by motile cells in

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

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