I’m an integrator, a contextual learner and a big picture kind of guy. I am willing to ‘slog’ through the details, the analyses of experts, to understand what is going on, when the details help me understand, in this case, the operation or ‘life’ of the whole organism. What are the processes, how do they influence one another and how does that result in the condition we recognize as the dynamic, animated phenomenon of living. Franklin Harold, a professor emeritus in biochemistry at Colorado State University when he wrote, “The Way of the Cell: Molecules, Organisms and the Order of Life”, in 2003, has produced the ‘best’, and most comprehensible, review I’ve found of the life in the cell, to date. This book does not require an advanced degree to follow. It requires an interest in biology. A botanist, horticulturist or even avid gardener pursuing a more thorough understanding of what life is and what is occurring within the plants and animals around will find much that is accessible to them here. This book is not a slog. It is readable and readily comprehensible, though for those with less of a science background, a little more challenging, but hey, nothing ventured, nothing gained. The jargon he uses I would say is necessary. Science can be very precise in how it views its subject, necessarily so, because meaning becomes lost when the precision of language is too generalized. I’m adding it to my own library. I include some extensive quotes here to give you a sense of his style and philosophy. I also gleaned much from these particular passages. In school I endured too many professors and lecturers who seemed more interested in impressing their students with their own brilliance, and our inferiority, and came to relish those who were true teachers, who were able to impart to their students, there own love and fascination with their topic. Harold is one of these. He set out to write a book that would reach out to the reader making his topic more accessible, more comprehensible and thus widen the circle of understanding…and he has succeeded.
The cell, scientists would agree, is the smallest fully functional unit of an organism, any organism. It is the basic structural unit that has been joined together to create larger, more complex organisms. If you attempt to reduce it any further, divide it into its component parts, which science typically does in its process of reduction to understand it in its parts, it loses functionality and dies. Single celled organisms, bacteria, archae, and the larger single celled eukaryotic organisms, like amoebas, comprise the majority of living species on earth, by both number of species and by sheer mass. They are as complete as any single organism, like ourselves, a Redwood or Blue Whale, can be. Whether a single celled organism or a massive multi celled organism made up of several billions of many thousand ‘types’ of different specialized cells, almost all cells are capable of all of their essential functions, as long as they are supplied with proper nutrients and flows of energy. Cells, as Harold describes them, are highly coordinated ‘societies’ comprised of many millions of individual proteins, enzymes, lipids and ions, with various forms of RNA, bound within a protective, limiting and self-regulating membrane, often with other internal membranes, which protect and allow other more specialized functions within the cell…and DNA, or in the cases of some bacteria, RNA, which contain the ‘code’ which prescribes the organism. It is within the cell membrane where the particular mixes of their constituent parts are held in dynamic flux, where the ‘work’ of living occurs. Within what was once described as a ‘soup’ of chemicals, suspended within a virtual sea of water, the cell conducts the ‘business’ of life. Today we understand that within a single cell water molecules far out number any other substance. Cells possess a complex internal structure, a cytoskeleton, grown from proteins, that is integral to the transport of metabolites, the regulation of its thousands of internal processes, the structure of the cell itself and essential to its ability to respond and move. The actions within the cell are largely self-regulating, influenced, certainly, by outside, and internal energy gradients. The various reactions influence the rate of other reactions in a complex system of feedback loops, with a ‘logic’ often compared to that utilized by a computer. Processes are chemical, electrical and ‘mechanical’ as one reaction induces a conformational change, a change in ‘shape’, of a particular protein or enzyme, which directly influences what it can do. These changes in ‘shape’ act as effective ‘switches’ within the cell, switches operating amongst thousands of other such switches, creating an intricate system of feedback loops which regulate just what the next step will be. Only functions tend not to be linear. They can be extremely complex, with a redundancy that also allows the cell to vary internally widely, while maintaining itself, overall, in a relatively stable state. Its internal complexity then accounts for its responsiveness and adaptability. It imparts a degree of flexibility, of adaptability to a system within the cell. All of this going on at a molecular level that plays out, with powerful effect, at the organismic level. Continue reading