About: Abstract Viruses are extremely abundant and diverse parasites of cells. They might have arisen during an early phase of the evolution of life on Earth dominated by RNA or RNA-like macromolecules, or when a cellular world was already well established. The theories of the origin of life on Earth shed light on the possible origin of primitive viruses or virus-like genetic elements in our biosphere. Some features of present day viruses, notably error-prone replication, might be a consequence of the selective forces that mediated their ancestral origin. Two views on the role of viruses in our biosphere predominate: viruses considered as opportunistic, selfish elements, and viruses considered as active participants in the construction of the cellular world via lateral transfers of genes. These two models bear on considering viruses predominantly as disease agents or predominantly as cooperators in the shaping of differentiated cellular organisms.

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About: Abstract Viruses are extremely abundant and diverse parasites of cells. They might have arisen during an early phase of the evolution of life on Earth dominated by RNA or RNA-like macromolecules, or when a cellular world was already well established. The theories of the origin of life on Earth shed light on the possible origin of primitive viruses or virus-like genetic elements in our biosphere. Some features of present day viruses, notably error-prone replication, might be a consequence of the selective forces that mediated their ancestral origin. Two views on the role of viruses in our biosphere predominate: viruses considered as opportunistic, selfish elements, and viruses considered as active participants in the construction of the cellular world via lateral transfers of genes. These two models bear on considering viruses predominantly as disease agents or predominantly as cooperators in the shaping of differentiated cellular organisms. Goto Sponge NotDistinct Permalink

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type	abstract
value	Abstract Viruses are extremely abundant and diverse parasites of cells. They might have arisen during an early phase of the evolution of life on Earth dominated by RNA or RNA-like macromolecules, or when a cellular world was already well established. The theories of the origin of life on Earth shed light on the possible origin of primitive viruses or virus-like genetic elements in our biosphere. Some features of present day viruses, notably error-prone replication, might be a consequence of the selective forces that mediated their ancestral origin. Two views on the role of viruses in our biosphere predominate: viruses considered as opportunistic, selfish elements, and viruses considered as active participants in the construction of the cellular world via lateral transfers of genes. These two models bear on considering viruses predominantly as disease agents or predominantly as cooperators in the shaping of differentiated cellular organisms.
part of	Chapter 1 Introduction to Virus Origins and Their Role in Biological Evolution
is abstract of	Chapter 1 Introduction to Virus Origins and Their Role in Biological Evolution

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