Animal Cell Plant Cell In plant cells, if a plant cell is placed in distilled water, water molecules will move from the distilled water to the cell, the cell swells up and becomes turgid but it will never burst because plant cells are surrounded by cell walls, which are made of cellulose and is elastic, it will stretch but never break, the cell becomes turgid. If we place a plant cell in a concentrated salt solution whith low water potential, water will move from the cell to the solution causing the cell to become plasmolysed as in the diagram. Active transport occurs in cells, it is basically the movement of molecules or ions from a region of their low concentration to a region of their high concentration against the concentration gradient using energy of respiration.
The classical definition of Biology is: Biology is the science of life. A more realistic and accurate definition of Biology is the reductionist definition: Biology is the natural science that studies the no-spontaneous transfer of energy and the quasi-stable systems that experience it.
Now that we have inferred a realistic definition of life, things will go easier. My definition of life is based on careful observations about O level biology ecology behavior of the state of equilibrium in biosystems.
In general, we knew that life was related to the thermodynamic descriptions assigned to the evolution of the universe.
Thus, many things that the theory of life had not elucidated now are solved. For example, the origin of life, when the inert coacervates, or primitive protobionts, were converted into bionts living beingswhy currently living beings do not emerge by non-biological synthesis; if a virus is or it is not a living being; the meaning of biological death, etc.
The knowledge about the diversity of life forms and their conservation-exploitation is of great importance for our day by day life. Well, all we have got ill some times and in order that our doctor was able to accomplish a good diagnosis from our illness, he or she had to be familiar with the normal organic functions that we consider within the homeostatic parameters.
This normal state, or homeostasis, is investigated by Biology. The study on the origin of diseases and plagues is also answerable by means of Biology, for example the etiology of cancer, infections, functional problems, the damage to fruits, the pathologies of farm animals, plants, trees, etc.
Food resources and quality, factors that cause illnesses, plagues, sustainable exploitation of natural resources, the enhancement and development of useful species, the discovery and production of medicines, the study of the functions of living beings, their inheritance, etc.
The food that we consume are materials produced by living beings, the Biology studies the living beings and the processes implied in the production of those nutritional substances.
Besides, by means of the Biotechnology, the Biologists search for methods that make to the producers to be more efficient in the elaboration of food and other supplies for humans. The Biology covers the study of all the living beings and their interactions into the biosphere.
The Biology also investigate the environmental factors that surround the living beings; and, by means of conservationism, it seeks for more effective ways to understand the variations or new conditions of the environment that can threaten the existence of living beings on our planet.
The interaction of charged particles, electrons and protons, through uncharged particles, expressly through photons, determines the positions and momentums of the energy during the performance of the Proton Motive Force. The exact quantity of kinetic energy, associated with its location in a given time and space is known as a microstate of the energetic molecules or thermodynamic systems.
It depends on the Biotic Fieldspecifically, on the amount of energy assigned for the space where the interaction of charged particles happens - promoted by photons- to generate the Proton Motile Force, which is the physical expression, detectable and quantifiable, of life.
This nature of interactions between charged particles through photons takes place in any electrodynamic field.
We do not have a direct definition of life, but from direct and indirect observations of the thermal state of the living structures, we can give the next definition of life: Life is a delay of the spontaneous diffusion or dispersion of the internal energy of the biomolecules towards more potential microstates.
An operational definition is a description of a variable, a term, or an object in terms of the specific process or the set of corroboration assessments used to determine its existence and quantity.
The properties described by an operational definition should be publicly accessible so that one or more persons —other than the person that defined the concept- can measure it or test it independently at will, for themselves. An operational definition is generally designed to model a conceptual definition, to be precise, by using words and concepts to describe a variable.
Phase Space is the space at which all the possible states of a system are represented. The phase space is produced by the general positions and their corresponding conjugated moments.
A conjugated moment derives from the difference between the kinetic energy and the potential energy in relation to an integral coordinate.
Delaying is not the same as revert; although revert could cause a delay, it is not the behavior of processes or states in nature. Many authors say that life involves a violation of the second law of thermodynamics, or that it follows trajectories against entropy, which is not factual.
The referred law indicates that the energy always flows from a space or system with a high density of energy toward another space or system with a lower density of energy, which is precisely how life occurs.
The Universe has a higher density of energy than that of the biosystems.
If it were not thus, then life would not be possible. The confusion was originated when some properties associated with the entropy were subordinated like alternatives to explain biotic features; for example, order, complexity, etc.Providing study notes, tips, and practice questions for students preparing for their O level or upper secondary examinations.
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You can find notes and exam questions for Additional math, Elementary math, Physics, Biology and Chemistry. Tips and notes for English, . Envision brings together a powerful group of UK researchers with industry and NGO partners to provide a new generation of environmental scientists with the skills, knowledge and experience they need to take on the challenges of a changing world.
Biology is the natural science that studies the no-spontaneous transfer of energy and the quasi-stable systems that experience it. Biology Notes For Olevel Tuesday, 29 January Biology Notes For O-level Cell Structure and Organization. A cell is the smallest unit that can carry on all the processes of life.
Ecology: O level biology test has multiple choice questions. Effects of human activity on ecosystem test has multiple choice questions. Excretion: O level biology test has 48 multiple choice questions. Homeostasis in biology test has multiple choice questions.
Microorganisms and applications in biotechnology test has multiple.