BLG 230 Lecture Notes - Lecture 2: Stigmasterol, Plasmodesma, Cell Membrane
13 Feb 2019
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Document Summary
Cellular membrane composition: lipids sterols & phospholipids, proteins integral (transmembrane &. Others) & peripheral: carbohydrates glycoproteins and glycolipids. Plastids: bounded by an envelope consisting of 2 membranes. Internally, the plasmid may be differentiated into a system of membranes (thylakoids) and a homogenous matrix (stroma: wide diversity of plasmids. Functions of chloroplasts: site of photosynthesis light energy and co2 are used to form carbohydrates. Involved in synthesis of amino acids and fatty acids: provides temporary storage space for starch. Chromoplasts: pigmented plastid lacking chlorophyll, carotenoid pigments common (yellow, orange, red colours of flowers, aging leaves, fruits, roots, may develop from green chloroplasts, function, not well understood, act as attractants to pollinating animals. Leucoplast: non-pigmented plastid, lacking an elaborate system of inner membranes, amyloplasts synthesize starch, other leucoplasts synthesize oils and proteins. Proplastids: small, pale, colourless or pale undifferentiated plastids in meristematic cells.
