BIOLOGY 1B Lecture Notes - Lecture 31: Mitosis, Carrageenan, Gametophyte
7 Dec 2017
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Some eukaryotes have plastids surrounded by 3 or 4 membranes. Except green algae, red algae, and related land plants. 25% of earth"s primary productivity through photosynthesis. Among most diverse and ecologically important algae. Cells walls made of hydrated silica (glass-like) Made up of two halves that fit together like a petri dish. Take out some carbon from the carbon cycle temporarily. Helps with climate change in this way. Produce a new half of cell wall inside their half. All appear to descend from same ancestor that engulfed a red algae (secondary endosymbiosis) Doesn"t have the complex tissues or anatomy as land plants. Diverged from a common ancestor that acquired chloroplasts through. Closely related to green algae and land plants. Reddish pigments of deep-water red algae absorb light in primary endosymbiosis blue/green wavelengths which penetrates deepest in the water. Multicellular diploid organism (sporophyte) and multicellular haploid organism (gametophyte) during cycle. Carrageenan (thickening agents for foods) (red algae)
