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C Assessment of gene diversity in the red alga Gracilaria tenuistipitata Rhodophyta based on expressed sequences tags EST. The development of this molecule altered the earth atmosphere causing a great impact in the history of the planet, redirecting the evolution of life. The oxygenic photosynthesis amabis biologia volume unico developed early in the history of life by a group of prokaryotes, the cyanobacteria.
This ability was later laterally transferred to the eukaryotic realm by the acquisition amabis biologia volume unico photosynthetic organelles plastids through the engulfment and retention of formerly free living cyanobacteria by an ancient eukaryotic cell. Amabis biologia volume unico pdf files Such kind of cellular merging, called primary endosymbiosis, likely occurred only once.
Three lineages of extant algae including amabis biologia volume unico ancestors of land plants vertically evolved from the cells which first acquired plastids.
Later on, the photosynthetic apparatus was laterally transferred to other unrelated eukaryotic lineages through independent secondary endosymbiosis, i. This gave rise to the second-hand or secondary plastid-containing algae, a diverse assemblage including disparate organisms such as euglenoids, dinoflagellates and kelps.
Thus, the history of photosynthesis acquisition by eukaryotes is extremely complex, making very difficult to briefly define algae and to amabis biologia volume unico them from other organisms.
Current data support the view that plastid acquisition is a rather rare event and, accordingly, a single primary endosymbiosis followed by a few very ancient secondary endosymbiosis probably account for all extant plastid diversity. Mdppc manual The Rhodophyta is one of three extant lineages which arose from the primary endosymbiosis and one of the main monophyletic groups within the eukaryotes.
Traditionally the Rhodophyta has been divided in two subclasses, the paraphyletic Bangiophycidae and the monophyletic Florideophycidae. Amabis biologia volume unico Bangiophycidae are the ancestral pool for the more morphologically complex taxa in the Florideophycidae and from which the chromist algae chloroplasts have originated through secondary endosymbiosis.
Biologia Dos Organismos Volume 2 - Amabis
Among several misunderstandings and difficulties resulting from this metaphor, we have the problem that it emphasizes a purely informational conception of life. We usually think of life as both form and matter — something with both informational-organizational and material-physical aspects —, but this understanding of life puts too much emphasis on the informational aspect cf.
Emmeche The textbook sections about the origins of life contain important issues concerning life concepts. The treatment of this problem revolves around the possibilities of an origin by divine creation, or chemical evolution, or in some extraterrestrial place.
In these sections, the question of the evolution of processes that would make life possible is raised, e. Life would appear when an aggregate of molecules, endowed with the ability to perform ordered chemical reactions, extracting from the environment raw materials and energy, managed to maintain its organization and isolate itself from the environment.
Soares , for instance, states that the cell individuates itself through the differentiation of the intra- and extracellular media. We did not find, however, any book that addressed the circular, self-referential organization of living systems by employing the conceptual resources of this theory. The textbooks call attention to the alleged borderline instances between living systems and inanimate matter, in particular, to viruses, understood as exceptions.
Viruses and other molecular structures showing distinctive properties of both inanimate matter and living beings seem to be exceptional because they contradict our intuitions about the distinction between these two classes of entities. As living beings, we have a deep conviction that, in principle, we do know what is life and no remarkable difficulty should appear when we try to distinguish between a living being and something inanimate, or between the living and the dead states of organisms.
This distinction becomes difficult, however, when we consider equivocal cases such as viruses, viroids, prions, or a biochemical soup of RNA fragments in a laboratory.
To cast them aside as exceptions seems to be, at first, quite a natural and easy solution. But a thoughtful analysis can suggest that this solution is not so adequate. Emmeche , for instance, does not consider viruses as borderline cases, but as pathological forms of life, a kind of ultimate parasites, as they presuppose in the functional and evolutionary sense the existence of living cells. Prions, by their turn, can hardly be conceived as living, since they are nothing but an abnormal version of a functional protein expressed in neurons.
Due to a mistake in the post-translational modification of this protein, a non-functional version is produced, the prion protein. The gene that codifies the prion protein is in the host itself, so that the prion lacks genetic material and, in fact, cannot do copies of itself in the same sense as typical living beings do.
The prion protein simply catalyzes the very chemical reaction that results in itself. Surely, it may exist, and maybe even necessarily exists, borderline instances between living beings and non-living matter. Nonetheless, what seems strange in the above solution is that it follows necessarily from the attempt to propose lists of necessary and sufficient conditions for life. Thus, the characterization of viruses and other structures as borderline cases may be a reflection more of the inadequacy of our defining procedures than of the nature of what we are trying to define.
It is also interesting to examine the difficulties that follow from the classification of viruses as living beings. This argument is not sufficient, however, for avoiding a violation of the Cell Theory by viruses, as this theory states that the cell is the basic structural unit of all living beings, and this does not hold in the case of viruses, no matter whether they are strictly dependent on cells or not.
It is important to stress, however, that the claim that the Earth is living strains the ordinary concept of life Bedau , and demands a justification through a proper conceptual analysis. Finally, one finds in the analyzed textbooks a discussion about death, from the biological point of view, as the inevitable antithesis of life. Or, to put it differently, a characterization of life from its counter- example, death. Laurence observes that one of the characteristics of living beings is death, and, then, casts doubt on the claim that an amoeba dies, since it divides itself indefinitely.
At last, all living beings are subjected to death.
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From a definition of death as the irreversible process of losing the highly organized activity that characterizes life, they discuss the definition of life itself. Emmeche observes that definitions of life are seldom discussed in depth or even mentioned in biology textbooks and dictionaries. Therefore, it should be regarded as a positive aspect that the biology textbooks we examined here, albeit recognizing the difficulties involved in defining life, do not avoid the discussion about how one can characterize living beings, differentiating them from inanimate matter.
Moreover, it is even more pleasing to notice that some books explicitly deal with the problem of defining life. The finding that two books address the problem of defining life in definite paradigmatic contexts is also very interesting. Nonetheless, essentialist efforts to define life through lists of necessary and sufficient properties still predominate in the analyzed textbooks.
It is desirable, then, to address this problem in a non-essentialist manner, inasmuch as this is compatible with population thinking. Paradigmatic approaches to the definition of life can be very fruitful in the pedagogical transposition of the discussions about life concepts from theoretical biology to school knowledge.
The theory of autopoiesis may also be used as a basis for a discussion of life concepts in high school, when issues such as the origins of life and cellular metabolism are dealt with. Fundamentos de Biologia Moderna 2nd ed. Biologia 1st ed. Bio 1st ed. The Philosophy of Artificial Life.
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Oxford: Oxford University Press. Doctoral thesis. In press[b]. In press[a]. On some theoretical-grounds for an organism-centered biology: property emergence, supervenience, and downward causation. Theory in Biosciences Autopoietic systems, replicators, and the search for a meaningful biologic definition of life. Ultimate Reality and Meaning 20 4 : Los conceptos estruturales en el aprendizaje por investigacion. The Dialectical Biologist.
Paper submitted. The Great Chain of Being. Metaphors and the role of genes in development.
Bioessays 12 9 The Ontogeny of Information 2nd Ed. Durham: Duke University Press. New York: Columbia University Press. Durham: Duke University. The new problem of genetics: A response to Gifford. Biology and Philosophy Images of Development: Environmental Causes in Ontogeny.
Amsterdam: Vrije Universiteit.
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Does the textbook discuss the problem of defining life? Yes No 3. Does the textbook somehow discuss some characterization of living beings? As to the nature of the life definition s presented if there is any : The definition of life proposed is limited to a list of properties, seeking to characterize what a living being essentially is and what a non-living being essentially is essentialist view.
To put it differently, it is the case of trying to find a list of sufficient and necessary properties for a system to be characterized as living, with no theoretical paradigmatic justification for the choice of properties. The definition of life proposed includes a set of properties chosen under the light of an implicit theoretical paradigmatic justification, forming a coherent set of interrelated properties.
The definition of life proposed explicitly situates the life concept in a biological paradigm, trying to give this concept a meaning by connecting it with other concepts in that paradigm.
What is the list of properties presented by the textbook if there is any?Google Scholar Copyright information. Chromosomal activities in Rhynchosciara and other Sciaridae. Currently supported system indicators include.
Nucleic acid metabolism in polytene chromosomes and the problem of differentiation. Studies on DNA synthesis during larval development of Rhynchosciara sp. Learn The Bible In 24 Hours.
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