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This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
Overview of signal transduction pathways involved in apoptosis. Cell death is the event of a biological cell ceasing to carry out its functions. This may be the result of the natural process of old cells dying and being replaced by new ones, as in programmed cell death, or may result from factors such as diseases, localized injury, or the death of the organism of which the cells are part.
Cell damage (also known as cell injury) is a variety of changes of stress that a cell suffers due to external as well as internal environmental changes. Amongst other ...
3' untranslated region (3'-UTR). Also three-prime untranslated region, 3' non-translated region (3'-NTR), and trailer sequence.. 3'-end. Also three-prime end.. One of two ends of a single linear strand of DNA or RNA, specifically the end at which the chain of nucleotides terminates at the third carbon atom in the furanose ring of deoxyribose or ribose (i.e. the terminus at which the 3' carbon ...
Examples of toxic agents are toxic metals, toxic chemicals, microbe neurotoxins, radiation particles and even specific neurotransmitters when the system is out of balance. Also some types of drugs, e.g alcohol , [ 1 ] and some venom , e.g. from the puff adder ( Bitis arietans ) or brown recluse spider ( Loxosceles reclusa ) are toxic to cells.
Clastogen damage in certain areas of the chromosome can lead to instability, such as loss or damage to telomeres. [8] Studies have shown that rat cells that were exposed to chemical clastogens express telomeric irregularities in function and can remain for several cell generations after treatment has been attempted.
Since 1997, United States law has declared a list of bio-agents designated by the U.S. Department of Health and Human Services or the U.S. Department of Agriculture that have the "potential to pose a severe threat to public health and safety" to be officially defined as "select agents" and possession or transportation of them are tightly controlled as such. [5]
The damage caused by these various living and nonliving agents can appear very similar. [1] Even with close observation, accurate diagnosis can be difficult. [ 1 ] For example, browning of leaves on an oak tree caused by drought stress may appear similar to leaf browning caused by oak wilt , a serious vascular disease caused by a fungus, or the ...