. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. UNICELLULAR FORMS 11 Phylum Thallophyta (Simple. Often single cells. Lack true tis- sues.) Schizophyta f Blue-green alga^ (Reproduce by fission) [bacteria Algas—Contain chlorophyll. Seaweeds, Pond Scums. Fungi (No chlorophyll) YEASTS Molds Smuts Mushrooms Puffballs Phylum Bryophyta. Mosses and their allies. Phylum Pteridophyta. Ferns. Phylum Spermatophyta. Seed-bearing plants. The yeast plant, one of the Fungi, in its saprophytic nutrition strik- ingly illustrates a chemical process of metabo
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. UNICELLULAR FORMS 11 Phylum Thallophyta (Simple. Often single cells. Lack true tis- sues.) Schizophyta f Blue-green alga^ (Reproduce by fission) [bacteria Algas—Contain chlorophyll. Seaweeds, Pond Scums. Fungi (No chlorophyll) YEASTS Molds Smuts Mushrooms Puffballs Phylum Bryophyta. Mosses and their allies. Phylum Pteridophyta. Ferns. Phylum Spermatophyta. Seed-bearing plants. The yeast plant, one of the Fungi, in its saprophytic nutrition strik- ingly illustrates a chemical process of metabolism that in some form or other is carried on in the cells of all plants and animals and is one of the most important of the metabolic phenomena. This proc- ess is enzyme action. The yeast plant consists of single cells, or chains or loose groups of cells. Different species of yeast cells may be cylindrical, ellipsoidal, or spherical in shape (Fig. 24). Yeasts reproduce by a modified form of fission called bud- ding, in which the parent cell does not divide into two equal cells, but gives off a small daughter cell or cells, which may remain attached to the parent for a time. At moderately high room tempera- ture the yeast plant multiplies with considerable rapidity. The com- mon yeasts live quite well in sugar solutions and obtain their energy by breaking down the sugar into carbon dioxide and alcohol. The general name for this process is fermentation, but organisms per- form many such processes, so the term fermentation does not. Fig. 24.—Yeast Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buchanan, James William, 1888-. New York, London, Harper & brothers
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