By Jill Bailey
This dictionary covers all points of natural and utilized plant technological know-how, together with the taxonomy and type of crops, with entries for the higher-ranking taxa. concepts of nucleic acid expertise are incorporated, with references made to functions in horticulture and agriculture. The dictionary covers features of the AP Biology path, significantly the sections on Organisms and Populations in addition to Molecules and Cells.
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Additional resources for The Facts on File Dictionary of Botany (Facts on File Science Dictionaries)
Plant cells and most prokaryotic cells are surrounded by rigid cell walls. In multicellular organisms cells become specialized for different functions; this is called differentiation. Within the cell, further division of labor occurs between the organelles. cell division See meiosis; mitosis; amitosis. cell fractionation The separation of the different constituents of the cell into homogenous fractions. This is achieved by breaking up the cells in a mincer or grinder and then centrifuging the resultant liquid.
The large numbers of hydrogen bonds that form between the base pairs along a DNA or RNA molecule stabilize the double helix. The specificity of the pairing ensures that during REPLICATION and TRANSCRIPTION accurate copies are made of the genetic material. The number of base pairs is a measure of the length of the DNA or RNA molecule, which is often expressed in units of 100 bases (kilobases), meaning 100 base pairs. basidiospore See Basidiomycota; basidium. basidium (pl. basidia) The cell of the BAthat produces the sexual spores (basidiospores).
It is implicated in the uptake of calcium, the development of apical meristems, and pollen germination. bloom A sudden growth of microorganisms in a freshwater or marine ecosystem, often known as an algal bloom. This may occur naturally in spring, when growth of microorganisms is for a time unchecked by herbivores. It may also be brought on by nutrient enrichment of the water, often due to fertilizers being washed off agricultural land, or to seawater entering the marine environment. botanical 1.