Read e-book online Macmillan Dictionary of Genetics and Cell Biology PDF

By Norman MacLean

ISBN-10: 0333467647

ISBN-13: 9780333467640

ISBN-10: 1349189057

ISBN-13: 9781349189052

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Extra resources for Macmillan Dictionary of Genetics and Cell Biology

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Anaphylaxis. Increased reactivity of the whole body following a repeated antigenic stimulus. It results from the release of pharmacologically active agents usually following interaction of an antigen with specific antibody 'fixed' to tissue cells via an Fe receptor (see ALLERGY). Reactions are very rapid (classed as immediate hypersensitivity) and can be local as well as systemic. anastral mitosis. MITOSIS in dividing cells involving SPINDLE formation without apparent centrioles or asters. Such mitosis occurs normally in cells of higher plants.

ADP (adenosine diphosphate). NUCLEOTIDE composed Of ADENINE, RIBOSE and two phosphate groups. It is an important coenzyme and can undergo further phosphorylation to yield ATP, which is the prime energy-rich intermediate in cellular metabolism. The phosphorylation of ADP to ATP OCCUrS within MITOCHONDRIA, and ADPfATP ratios and levels within the cell help to determine rates of ANABOLISM and CATABOLISM. adrenaline (epinephrine). HORMONE secreted by the chromaffin tissue of the mammalian adrenal medulla following stimulation by stress conditions, such as pain, fear and muscular activity.

Anopheline larvae have POLYTENE CHROMOSOMES within the cells of their salivary glands. anther culture. Technique whereby HAPLOID plants are produced from pollen, following the induction of embryo formation. It is particularly successful in Gramineae and Solanaceae. antheridium. Male gametangium, gameteproducing structure, of bryophytes, algae, fungi and pteridophytes. It often consists of a stalked structure with a globular head containing the gametes. antherozoid (spermatozoid). Motile male gamete of fungi and many lower plants, such as algae, bryophytes and a few gymnosperms.

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Macmillan Dictionary of Genetics and Cell Biology by Norman MacLean

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