. Adventures with animals and plants. Biology. io8 Livmg very important part in the life of the cell and of the organism. Frequently one or more small round bodies are found within the nucleus. They are called micleoU (new-klee'o- lie; singular, nucle'o-lus). The nucleolus, too, is readily stained. We do not know what work it does in the cell. The structure of protoplasm. You read above that cytoplasm appears through the microscope to be a thickish liquid, colorless or light grey in color, contain- ing small particles or granules, and that the nucleus looks much like it, only denser. Exercise
. Adventures with animals and plants. Biology. io8 Livmg very important part in the life of the cell and of the organism. Frequently one or more small round bodies are found within the nucleus. They are called micleoU (new-klee'o- lie; singular, nucle'o-lus). The nucleolus, too, is readily stained. We do not know what work it does in the cell. The structure of protoplasm. You read above that cytoplasm appears through the microscope to be a thickish liquid, colorless or light grey in color, contain- ing small particles or granules, and that the nucleus looks much like it, only denser. Exercise 9 will be helpful now. Staining protoplasm with dyes has helped somewhat to bring out its structure but no one can be certain that the stain has not caused changes or produced sub- stances not present in the unstained pro- toplasm. Although it seems to be comparatively simple when seen through the micro- scope experiments have shown that pro- toplasm is really a very complicated mixture of many substances. Some of these substances are dissolved in water. Some cannot dissolve in water and they form what is called a suspension. (Raw white of &^^ is a good example of a suspension.) The important fact about protoplasm is that it seems to have a very definite and complicated structure and it keeps this same structure, in general, as long as it remains alive. High or very low temperatures, dryness, or other changes in the surroundings, of course, may kill it. Of what is protoplasm composed? 1 he studv of substances, their composition or make-up, is called chemistry. To find Things Are Basically Alike unit ii. Fig. 142 The 12 most common elements in plant and animal protoplast)!. Calcium (Ca), sodium (Na), and chlomie (CI) are not always present. Symbols are explained at the bottom of this cohnmi. Which fojtr elemefits are present in the largest anioimts? What proportion of proto- plas?n is oxygen? Percentages are calculated by weight. out what substances make up protoplasm biolog
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