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Biology is the science that studies living organisms and their interactions with one another and their environments. Science attempts to describe and understand the nature of the universe in whole or in part by rational means. Science has many fields; those fields related to the physical world and its phenomena are considered natural sciences.
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Science can be basic or applied. The main goal of basic science is to expand knowledge without any expectation of short-term practical application of that knowledge. The primary goal of applied research, however, is to solve practical problems.
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Two types of logical reasoning are used in science. Inductive reasoning uses particular results to produce general scientific principles. Deductive reasoning is a form of logical thinking that predicts results by applying general principles. The common thread throughout scientific research is the use of the scientific method, a step-based process that consists of making observations, defining a problem, posing hypotheses, testing these hypotheses, and drawing one or more conclusions. The testing uses proper controls. Scientists present their results in peer-reviewed scientific papers published in scientific journals. A scientific research paper consists of several well-defined sections: introduction, materials and methods, results, and, finally, a concluding discussion. Review papers summarize the research done in a particular field over a period of time.
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Biology is the science of life. All living organisms share several key properties such as order, sensitivity or response to stimuli, reproduction, growth and development, regulation, homeostasis, and energy processing. Living things are highly organized parts of a hierarchy that includes atoms, molecules, organelles, cells, tissues, organs, and organ systems. Organisms, in turn, are grouped as populations, communities, ecosystems, and the biosphere. The great diversity of life today evolved from less-diverse ancestral organisms over billions of years. A diagram called a phylogenetic tree can be used to show evolutionary relationships among organisms.
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Biology is very broad and includes many branches and subdisciplines. Examples include molecular biology, microbiology, neurobiology, zoology, and botany, among others.
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abstract : opening section of a scientific paper that summarizes the research and conclusions
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applied science : form of science that aims to solve real-world problems
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atom : smallest and most fundamental unit of matter
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basic science : science that seeks to expand knowledge and understanding regardless of the short-term application of that knowledge
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biochemistry : study of the chemistry of biological organisms
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biology : the study of living organisms and their interactions with one another and their environments
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biosphere : collection of all the ecosystems on Earth
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botany : study of plants
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cell : smallest fundamental unit of structure and function in living things
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community : set of populations inhabiting a particular area
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conclusion : section of a scientific paper that summarizes the importance of the experimental findings
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control : part of an experiment that does not change during the experiment
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deductive reasoning : form of logical thinking that uses a general inclusive statement to forecast specific results
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descriptive science : (also, discovery science) form of science that aims to observe, explore, and investigate
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discussion : section of a scientific paper in which the author interprets experimental results, describes how variables may be related, and attempts to explain the phenomenon in question
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ecosystem : all the living things in a particular area together with the abiotic, nonliving parts of that environment
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eukaryote : organism with cells that have nuclei and membrane-bound organelles
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evolution : process of gradual change during which new species arise from older species and some species become extinct
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falsifiable : able to be disproven by experimental results
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homeostasis : ability of an organism to maintain constant internal conditions
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hypothesis : suggested explanation for an observation, which can be tested
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hypothesis-based science : form of science that begins with a specific question and potential testable answers
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inductive reasoning : form of logical thinking that uses related observations to arrive at a general conclusion
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introduction : opening section of a scientific paper, which provides background information about what was known in the field prior to the research reported in the paper
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life science : field of science, such as biology, that studies living things
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macromolecule : large molecule, typically formed by the joining of smaller molecules
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materials and methods : section of a scientific paper that includes a complete description of the substances, methods, and techniques used by the researchers to gather data
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microbiology : study of the structure and function of microorganisms
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molecular biology : study of biological processes and their regulation at the molecular level, including interactions among molecules such as DNA, RNA, and proteins
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molecule : chemical structure consisting of at least two atoms held together by one or more chemical bonds
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natural science : field of science that is related to the physical world and its phenomena and processes
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neurobiology : study of the biology of the nervous system
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organ : collection of related tissues grouped together performing a common function
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organ system : level of organization that consists of functionally related interacting organs
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organelle : small structures that exist within cells and carry out cellular functions
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organism : individual living entity
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paleontology : study of lifeâs history by means of fossils
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peer-reviewed manuscript : scientific paper that is reviewed by a scientistâs colleagues who are experts in the field of study
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phylogenetic tree : diagram showing the evolutionary relationships among various biological species based on similarities and differences in genetic or physical traits or both; in essence, a hypothesis concerning evolutionary connections
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physical science : field of science, such as geology, astronomy, physics, and chemistry, that studies nonliving matter
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plagiarism : using other peopleâs work or ideas without proper citation, creating the false impression that those are the authorâs original ideas
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population : all of the individuals of a species living within a specific area
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prokaryote : single-celled organism that lacks organelles and does not have nuclei surrounded by a nuclear membrane
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results : section of a scientific paper in which the author narrates the experimental findings and presents relevant figures, pictures, diagrams, graphs, and tables, without any further interpretation
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review article : paper that summarizes and comments on findings that were published as primary literature
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science : knowledge that covers general truths or the operation of general laws, especially when acquired and tested by the scientific method
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scientific method : method of research with defined steps that include observation, formulation of a hypothesis, testing, and confirming or falsifying the hypothesis
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serendipity : fortunate accident or a lucky surprise
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theory : tested and confirmed explanation for observations or
phenomena
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tissue : group of similar cells carrying out related functions
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variable : part of an experiment that the experimenter can vary or
change
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zoology : study of animals
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Matter is anything that occupies space and has mass. It is made up of elements. All of the 92 elements that occur naturally have unique qualities that allow them to combine in various ways to create molecules, which in turn combine to form cells, tissues, organ systems, and organisms. Atoms, which consist of protons, neutrons, and electrons, are the smallest units of an element that retain all of the properties of that element. Electrons can be transferred, shared, or cause charge disparities between atoms to create bonds, including ionic, covalent, and hydrogen bonds, as well as van der Waals interactions.
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Water has many properties that are critical to maintaining life. It is a polar molecule, allowing for the formation of hydrogen bonds. Hydrogen bonds allow ions and other polar molecules to dissolve in water. Therefore, water is an excellent solvent. The hydrogen bonds between water molecules cause the water to have a high heat capacity, meaning it takes a lot of added heat to raise its temperature. As the temperature rises, the hydrogen bonds between water continually break and form anew. This allows for the overall temperature to remain stable, although energy is added to the system. Water also exhibits a high heat of vaporization, which is key to how organisms cool themselves by the evaporation of sweat. Waterâs cohesive forces allow for the property of surface tension, whereas its adhesive properties are seen as water rises inside capillary tubes. The pH value is a measure of hydrogen ion concentration in a solution and is one of many chemical characteristics that is highly regulated in living organisms through homeostasis. Acids and bases can change pH values, but buffers tend to moderate the changes they cause. These properties of water are intimately connected to the biochemical and physical processes performed by living organisms, and life would be very different if these properties were altered, if it could exist at all.
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The unique properties of carbon make it a central part of biological molecules. Carbon binds to oxygen, hydrogen, and nitrogen covalently to form the many molecules important for cellular function. Carbon has four electrons in its outermost shell and can form four bonds. Carbon and hydrogen can form hydrocarbon chains or rings. Functional groups are groups of atoms that confer specific properties to hydrocarbon (or substituted hydrocarbon) chains or rings that define their overall chemical characteristics and function.
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acid : molecule that donates hydrogen ions and increases the concentration of hydrogen ions in a solution
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adhesion : attraction between water molecules and other molecules
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aliphatic hydrocarbon : hydrocarbon consisting of a linear chain of carbon atoms
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anion : negative ion that is formed by an atom gaining one or more electrons
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aromatic hydrocarbon : hydrocarbon consisting of closed rings of carbon atoms
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atom : the smallest unit of matter that retains all of the chemical properties of an element
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atomic mass : calculated mean of the mass number for an elementâs isotopes
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atomic number : total number of protons in an atom
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balanced chemical equation : statement of a chemical reaction with the number of each type of atom equalized for both the products and reactants
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base : molecule that donates hydroxide ions or otherwise binds excess hydrogen ions and decreases the concentration of hydrogen ions in a solution
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buffer : substance that prevents a change in pH by absorbing or releasing hydrogen or hydroxide ions
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calorie : amount of heat required to change the temperature of one gram of water by one degree Celsius
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capillary action : occurs because water molecules are attracted to charges on the inner surfaces of narrow tubular structures such as glass tubes, drawing the water molecules to the sides of the tubes
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cation : positive ion that is formed by an atom losing one or more electrons
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chemical bond : interaction between two or more of the same or different atoms that results in the formation of molecules
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chemical reaction : process leading to the rearrangement of atoms in molecules
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chemical reactivity : the ability to combine and to chemically bond with each other
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cohesion : intermolecular forces between water molecules caused by the polar nature of water; responsible for surface tension
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compound : substance composed of molecules consisting of atoms of at least two different elements
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covalent bond : type of strong bond formed between two of the same or different elements; forms when electrons are shared between atoms
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dissociation : release of an ion from a molecule such that the original molecule now consists of an ion and the charged remains of the original, such as when water dissociates into H+and OH-
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electrolyte : ion necessary for nerve impulse conduction, muscle contractions and water balance
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electron : negatively charged subatomic particle that resides outside of the nucleus in the electron orbital; lacks functional mass and has a negative charge of â1 unit
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electron configuration : arrangement of electrons in an atomâs electron shell (for example, 1s22s22p6)
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electron orbital : how electrons are spatially distributed surrounding the nucleus; the area where an electron is most likely to be found
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electron transfer : movement of electrons from one element to another; important in creation of ionic bonds
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electronegativity : ability of some elements to attract electrons (often of hydrogen atoms), acquiring partial negative charges in molecules and creating partial positive charges on the hydrogen atoms
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element : one of 118 unique substances that cannot be broken down into smaller substances; each element has unique properties and a specified number of protons
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enantiomers : molecules that share overall structure and bonding patterns, but differ in how the atoms are three dimensionally placed such that they are mirror images of each other
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equilibrium : steady state of relative reactant and product concentration in reversible chemical reactions in a closed system
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evaporation : separation of individual molecules from the surface of a body of water, leaves of a plant, or the skin of an organism
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functional group : group of atoms that provides or imparts a specific function to a carbon skeleton
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geometric isomer : isomer with similar bonding patterns differing in the placement of atoms alongside a double covalent bond
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heat of vaporization of water : high amount of energy required for liquid water to turn into water vapor
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hydrocarbon : molecule that consists only of carbon and hydrogen
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hydrogen bond : weak bond between slightly positively charged hydrogen atoms to slightly negatively charged atoms in other molecules
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hydrophilic : describes ions or polar molecules that interact well with other polar molecules such as water
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hydrophobic : describes uncharged non-polar molecules that do not interact well with polar molecules such as water
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inert gas : (also, noble gas) element with filled outer electron shell that is unreactive with other atoms
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ion : atom or chemical group that does not contain equal numbers of protons and electrons
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