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Semiconservative replication describes the mechanism of DNA replication in all known cells. DNA replication occurs on multiple origins of replication along the DNA template strands. As the DNA double helix is unwound by helicase, replication occurs separately on each template strand in antiparallel directions. This process is known as semi ...
Thus the concept of life course implies age-differentiated social phenomena distinct from uniform life-cycle stages and the life span. Life span refers to duration of life and characteristics that are closely related to age but that vary little across time and place. In contrast, the life course perspective elaborates the importance of time ...
Within his theory, Daniel Levinson explains both the concept of adulthood itself as well as the stages by which development occurs. In order to do so effectively, he must differentiate between the life course and the life cycle. The life course, as he sees it, is the chronological process of living; from the beginning of life until the end.
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
The entire gametophyte generation, with the sole exception of pollen grains (microgametophytes), is contained within the sporophyte. The life cycle of a dioecious flowering plant (angiosperm), the willow, has been outlined in some detail in an earlier section (A complex life cycle). The life cycle of a gymnosperm is similar.
Kyklos (Ancient Greek: κύκλος , "cycle") is a term used by some classical Greek authors to describe what they considered as the cycle of governments in a society. It was roughly based on the history of Greek city-states in the same period. The concept of the kyklos is first elaborated by Plato, Aristotle, and most extensively Polybius ...
The continuum concept is an idea, coined by Jean Liedloff in her 1975 book The Continuum Concept, that human beings have an innate set of expectations (which Liedloff calls the continuum) that our evolution as a species has designed us to meet in order to achieve optimal physical, mental, and emotional development and adaptability.
The enlarged cells that are able to re-enter the cell cycle are prone to DNA damage and experience abnormalities in signaling for repair (NHEJ pathway), eventually leading to a replication failure and a permanent cell-cycle exit. [24] Overall, a consistent correlation between larger cell size and senescence has been established.