BIOL 2100 Lecture Notes - Lecture 18: P680, Light Work, Photophosphorylation
18 Oct 2016
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Photosynthesis: conversion of light energy to chemical energy that is stored in sugars/other organic chemicals. Plants, algae, and certain prokaryotes: organism acquires the organic compounds it uses for energy and carbon skeletons. Survive w/o having to eat anything derived from living things. Produce their organic molecules from co2 and other inorganic raw materials. Ultimate source of organic compounds for all nonautotrophic organisms: why biologists refer to autotrophs as the producers of the biosphere, almost all plants are autotrophs. They need: h20, minerals from soil, co2, plants are speci cally photoautotrophs use light as a source of energy to synthesize organic substances. Photosynthesis also occurs in algae, unicellular eukaryotes, and some prokaryotes. Heterotrophs: obtain organic material by the 2nd major mode of nutrition. Unable to make their own food, they live on compounds produced by other organisms. Unable to make their own food, they live on compounds produced by other other. Almost all heterotrophs are dependent on photoautotrophs for food.
