Books > Science & Mathematics > Biology, life sciences > Life sciences: general issues
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Molecular and Cellular Mechanisms in Disease - 1: Bioenergetics * Cell Specificity * Inborn Errors of Metabolism * Malnutrition * Calcium and Phosphorus Iron and Bile Pigments * Coagulopathies * Hormones Body Fluids and Electrolytes (Paperback, Softcover reprint of the original 1st ed. 1976)
Loot Price: R1,688
Discovery Miles 16 880
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Molecular and Cellular Mechanisms in Disease - 1: Bioenergetics * Cell Specificity * Inborn Errors of Metabolism * Malnutrition * Calcium and Phosphorus Iron and Bile Pigments * Coagulopathies * Hormones Body Fluids and Electrolytes (Paperback, Softcover reprint of the original 1st ed. 1976)
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In spite of ingenious experiments, imaginative theories, and
unshakable faith in supreme forces, there is no way to know how
life began. What is certain is that in the course of the
development of the universe existing sources of energy fused to
generate atoms, and atoms mingled to become small molecules. At
some point by chance or design-according to one's belief, but no
one's evidence-small molecules such as hydrogen, oxygen, carbon
dioxide, water, and ammonia reacted to yield larger molecules with
the property most essential to life: self-replication. Such
molecules had to achieve a proper balance between the stability
needed for their survival in the environment and the mutability for
the generation of many forms of life. How amino acids were created
or how DNA, RNA, and proteins developed remains a mystery. But we
know that a simple core of nucleic acid embedded in a protein coat
made the simplest unit of life (except for viroids). Whether
viruses are a primitive or degenerated form of life is not known.
Once proteins appeared, their great structural plasticity allowed
them to react with other elements such as sulfur, iron, copper, and
zinc. After an incalculable number of years, some of the proteins
became capable of catalyzing the synthesis of new nucleic acids,
new proteins, and other compounds such as polysaccharides and
lipids.
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