Concepts in BiologyWm. C. Brown Publishers, 1991 - 535 страница Concepts in Biology is a short, student-friendly text organized in a traditional manner. It has very little botany and presents a human-oriented approach to the animal unit. Professors and students appreciate the low cost of this title, and that it is written for students who are not biology majors. |
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Страница 21
... nucleus . The third type of particle is in the region surrounding the nucleus ( figure 2.1 ) . The weight , or mass , of the atom is concentrated in the nucleus , which is composed of neutrons and protons . One major group of particles ...
... nucleus . The third type of particle is in the region surrounding the nucleus ( figure 2.1 ) . The weight , or mass , of the atom is concentrated in the nucleus , which is composed of neutrons and protons . One major group of particles ...
Страница 24
... nucleus so fast they can be thought of as forming a cloud around it , rather than an orbit or track . You might think of the electron cloud as hundreds of photographs of an atom . Each photograph shows where an electron was at the time ...
... nucleus so fast they can be thought of as forming a cloud around it , rather than an orbit or track . You might think of the electron cloud as hundreds of photographs of an atom . Each photograph shows where an electron was at the time ...
Страница 27
... Nucleus : 11 1s 19 protons 20 neutrons lons Now that you know how to position electrons correctly , it would be convenient if all atoms always followed the rules . Remember that atoms are neutral because they have an equal number of ...
... Nucleus : 11 1s 19 protons 20 neutrons lons Now that you know how to position electrons correctly , it would be convenient if all atoms always followed the rules . Remember that atoms are neutral because they have an equal number of ...
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What Is Biology? | 2 |
What Is Biology? | 11 |
1 Edward Jenner and | 15 |
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activities allele amino acids amount animals atoms attached bacteria behavior biological body bonds called carbohydrates carbon dioxide cause cell membrane cellular cellular respiration centrioles changes chapter characteristics chemical chromatids complex contain cycle cytoplasm diet diploid disease ecosystem EeDd electrons energy environment enzyme eukaryotic example factors female fertilization Figure free earlobes function gametes gene frequencies gene pool genetic genotype glands glucose growth haploid homologous chromosomes hormones human hydrogen increase individual insects intestine involved ions kcalories kinds living things male materials meiosis metabolic mitosis mRNA muscle mutation neuron nitrogen normal nucleotides nucleus nutrients occur offspring oocyte organelles organic molecules ovary oxygen pair parasites PGAL phosphate photosynthesis plants population produce prokaryotic protein protons pyruvic acid reactions released reproduction respiration result ribosomes sexual species sperm stage structure substrate sugar surface synthesis trophic level vitamins X chromosome