BIOL-1507EL Lecture Notes - Lecture 1: Cyanobacteria, Photorespiration, Cell Membrane
16 Feb 2017
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All plants defined in this text are multicellular, eukaryotes, that are photosynthetic, autotrophs. Plants have cell walls made of cellulose. Carbohydrate is stored in the form of starch, generally in chloroplasts and other plastids. Mitosis occurs in all plants proceeding through the typical phases. Nearly all plants reproduce sexually and most are capable of asexual propagation. In the life cycle of all plants an alternative generation occurs in which a haploid (n) gametophyte and diploids (2n) sporophyte take turns producing one another. For (cid:373)ore tha(cid:374) the first three (cid:271)illio(cid:374) years of earth"s history: the terrestrial surfa(cid:272)e was lifeless. Geo-chemical evidence suggests that thin coating of cyanobacteria (blue-green algae) existed on the land about 1-2 billion years ago. It was only about 500 million years ago that plants, fungi, and animals joined them ashore. Evidence suggests that land plants have evolved from aquatic green algae (known as charophcean) the closest relative to land plants.
