Frasi di Albert Lester Lehninger (19 frasi)

Albert Lester Lehninger: 19 frasi 0 Mi piace

Albert Lester Lehninger: Frasi in inglese

“The chemistry of living organisms is organized around carbon, which accounts for more than half the dry weight of cells.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“The distinguishing characteristics of eukaryotes are the nucleus and a variety of membrane-enclosed organelles with specific functions.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“The current understanding that all organisms share a common evolutionary origin is based in part on this observed universality of chemical intermediates and transformations, often termed "biochemical unity."”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“As a result, there is an electrostatic attraction between the oxygen atom of one water molecule and the hydrogen of another (Fig. 2-lb), called a hydrogen bond.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 2 : Water

“Despite these common properties, and the fundamental unity of life they reveal, it is difficult to make generalizations about living organisms.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“The first living organisms on Earth doubtless arose in an aqueous environment, and the course of evolution has been shaped by the proper ties of the aqueous medium in which life began.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 2 : Water

“The upper limit of cell size is probably set by the rate of diffusion of solute molecules in aqueous systems.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“The remarkable similarity of metabolic pathways and gene sequences across the phyla argues strongly that all modern organisms are derived from a common evolutionary progenitor by a series of small changes (mutations), each of which conferred a selective advantage to some organism in some ecological niche.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“In thermodynamic terms, formation of the solution occurs with a fa vorable free-energy change: ΔG = ΔH - TΔS, where ΔH has a small positive value and TΔS a large positive value; thus ΔG is negative.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 2 : Water

“Virtually every chemical reaction in a cell occurs at a significant rate only because of the presence of enzymes.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“Among the seminal discoveries in biology in the twentieth century were the chemical nature and the three-dimensional structure of the genetic material, deoxyribonucleic acid, DNA.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“All living organisms fall into one of three large groups (domains) [Bacteria, Archeara, Eukarya] that define three branches of evolution from a common progenitor.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“Cells of all kinds share certain structural features.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“Organisms possess extraordinary attributes, properties that distinguish them from other collections of matter. What are these distinguishing features of living organisms?”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“Perhaps the most remarkable property of living cells and organisms is their ability to reproduce themselves for countless generations with nearly perfect fidelity. This continuity of inherited traits implies constancy, over millions of years, in the structure of the molecules that contain the genetic information.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“Water is a polar solvent. It readily dissolves most bio molecules, which are generally charged or polar com pounds (Table 2-2); compounds that dissolve easily in water are hydrophilic (Greek, "water-loving"). In contrast, nonpolar solvents such as chloroform and benzene are poor solvents for polar biomolecules but easily dis solve those that are hydrophobic-nonpolar molecules such as lipids and waxes.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 2 : Water

“We can consider cellular energy conversions—like all other energy conversions—in the context of the laws of thermodynamics.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“The unity and diversity of organisms become apparent even at the cellular level.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

“Biochemistry asks how the remarkable properties of living organisms arise from the thousands of different biomolecules.”

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Albert L. Lehninger

Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

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