Biology Macmillan Science Library by Richard Robinson

By Richard Robinson

Watch electrons zip round the nucleus of a carbon atom ... keep on with alongside as protozoa swim throughout colourful monitors ... See photosynthesis illustrated by way of "black boxes," with chemical compounds relocating out and in or among the bins ...

Something for college students who want a little additional aid figuring out uncomplicated organic techniques and phrases. This enticing, five-disk set of interactive Macintosh tutorials comprises the most recent desktop applied sciences to outline, clarify, and visually painting recommendations in a enjoyable, but significant means. This stronger model positive aspects clearer, extra compelling presentation and extended topical insurance.

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Upon reaching maturity, the haploid organism creates haploid egg and sperm cells (gametes) by mitosis. Because the haploid organism creates gametes, it is called the gametophyte generation of the life cycle. The male gametes (sperm) are then released and swim to the female egg. Fusion of the gametes creates the new diploid sporophyte, completing the life cycle. Whereas the fern gametophyte and sporophyte generations are completely independent, in some types of plants one generation lives on or in the other and depends on it for nutrition.

When the disease was first recognized in the early 1980s, men who had sex with men were by far the largest affected risk group, followed by intravenous drug users who were sharing needles, individuals who received HIV-infected blood, and hemophiliacs who received infected clotting factors. Women who had sexual contact with infected men were recognized as being at high risk of contracting HIV, and if they were pregnant, passing it on to their unborn children. Though this disease was first recognized in the United States, cases soon appeared in many countries of the world.

These chemical messengers normally have wellregulated effects on body tissues. Abnormally high levels of some hormones (which may be caused by other changes described here) can change the sensitivity of tissues to the hormones, as well as stimulate the secretion of other hormones whose uncontrolled effects could be deleterious. Insulin, growth hormone, glucocorticoid hormones, and reproductive hormones have been suggested as candidates in this mechanism. enzymatic related to function of an enzyme lipid fat or waxlike molecule, insoluble in water carbohydrates sugars, starches, and other molecules combining carbon, hydrogen, and oxygen and serving as fuel or structural components organelle membranebound cell compartment mitochondria subcellular organelle that creates ATP used for energy-requiring processes in a cell oxidative characterized by oxidation, or loss of electrons enzyme protein that controls a reaction in a cell antioxidant substance that prevents damage from oxidation glucose simple sugar that provides energy to animal cells and is the building block of cellulose in plants connective tissue one of four types of body tissue, characterized by few cells and extensive extracellular material secretion material released from the cell Changes in the Immune System.

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