Life and Evolution: An Introduction to General BiologyHarcourt, Brace, 1926 - Всего страниц: 449 |
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Стр. 7
... single crystal , but this kind of reproduction differs from that occurring in an organism by being imposed from without , instead of occurring as a result of the inherent activity of the object . Certainly objects as a rule do not grow ...
... single crystal , but this kind of reproduction differs from that occurring in an organism by being imposed from without , instead of occurring as a result of the inherent activity of the object . Certainly objects as a rule do not grow ...
Стр. 15
... single complex compound , as many of Huxley's statements implied . It is doubtless an aggregation of many complex proteins , together with various other substances , which are equally essential to the maintenance of life . Protoplasm ...
... single complex compound , as many of Huxley's statements implied . It is doubtless an aggregation of many complex proteins , together with various other substances , which are equally essential to the maintenance of life . Protoplasm ...
Стр. 30
... single cell . Later the spermatozoön by which the egg is fertilized and stimulated to develop , was shown to be also a single cell , although one of very much smaller size . It soon came to be recognized that the development of the ...
... single cell . Later the spermatozoön by which the egg is fertilized and stimulated to develop , was shown to be also a single cell , although one of very much smaller size . It soon came to be recognized that the development of the ...
Стр. 34
... single coiled thread . This is the so - called spireme stage , and it is followed by a stage in which the chromatin is in the form of separate threads or rods , called chromosomes . When the nuclear membrane breaks down , the ...
... single coiled thread . This is the so - called spireme stage , and it is followed by a stage in which the chromatin is in the form of separate threads or rods , called chromosomes . When the nuclear membrane breaks down , the ...
Стр. 45
... single intact layer , as in snakes ; in the frog the cuticle comes off in large pieces , while in mammals the outer dead cells are shed gradually and unobtrusively in much smaller masses . In all these forms the cells are actively ...
... single intact layer , as in snakes ; in the frog the cuticle comes off in large pieces , while in mammals the outer dead cells are shed gradually and unobtrusively in much smaller masses . In all these forms the cells are actively ...
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according activities adapted afford alimentary canal amount animals appearance become birds blood body called carried causes cells changes characters chromosomes closely colony color common commonly complete connected consists contains continuous cross cytoplasm disease division effect eggs embryo evidence evolution experiments fact factors female fertilized followed forms frequently function germ give glands green grow heredity higher human important individuals influence insects kinds known later layer less living lower male mammals material means natural nerve normal nucleus observed occur organisms origin pairs parasites parents pass period plants possible present primitive probably problem produced protoplasm region relation relatively remains remarkable represented result secretion selection separated sexual reproduction showing side similar single social species stage structure substance successive surface theory tion tissue usually variety various wall young