BSC 1005 Ch. 2 Part 1
BSC 1005 Ch. 2 Part 1 BSC 1005
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This 3 page Class Notes was uploaded by Cristina Rodriguez on Saturday September 10, 2016. The Class Notes belongs to BSC 1005 at Florida Atlantic University taught by Diane Lowell in Fall 2016. Since its upload, it has received 235 views.
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Date Created: 09/10/16
Chapter 1 Definitions Review Sample Size – the number of experimental subjects or the number of times an experiment is repeated Scientific Theory – a scientific explanation that is supported by a lot of evidence, over a long time, by many researchers and has never been disproved (ex. Cell theory) Epidemiology – the study of patterns of disease in populations Correlation – a consistent relationship or link between variable Randomized clinical trial – randomly chosen subjects used in control and experimental groups to test an independent variable Review The bigger the sample size, the more likely that results will have statistical significance and are not due to chance The more experiments that support a hypothesis, the more confident we can be that it is true Advantages over controlled lab experiments Less expensive Can investigate harmful factors Have bigger sample sizes Can be studied over a long time Epidemiological studies answer questions that could not be tested through controlled laboratory experiments for ethical or practical reasons Correlation does not mean causation Clinical trials are only done at the end of the road of a scientific study and can only happen with the patient’s approval Chapter 2 Definition Biology – Scientific study of life Growth – the process of increasing in size Reproduction – the process of producing new organisms Homeostasis – the maintenance of a relatively constant internal environment Respond to stimuli – the process of reacting to their environment Metabolism – the breaking down of energy through a series of chemical reactions Matter anything that takes up space and has mass Elements – substances that cannot be chemically broken down Atom – the smallest unit of an element that still retains the property of that element Nucleus – the dense core of an atom Electrons – negatively charged Protons – positively charged Neutrons – no charge (NEUTRAL) Ion – charged atom that has gained or lost an electron Atomic Number – number of protons Mass Number – number of proton and neutrons Covalent Bond – a strong chemical linkage between two atoms based on the sharing of electrons Noncovalent Bonds – bond that link molecules together but are weaker than covalent bonds Hydrogen Bonds – a bond between partial charges Ionic Bonds a bond that forms between ions Molecule – smallest unit of a chemical compound Chemical Compounds – association of atoms of different chemical elements Organic Molecules – molecules that has a carbonbased backbone and at least one CH bond Inorganic Molecules – molecules that lack the carbonbased backbone and CH bonds Important Information All living things have 5 traits in common Growth Reproduction Homeostasis Respond to stimuli Use energy Singlecell organisms produce two genetically identical cells Multicellular organisms Variety of ways Seeds, eggs and sperm, etc. Genetic material Passed from parents to offspring Organisms use energy to grow and develop Some use energy from the sun while others get energy from other living organisms The atom is the smallest unit that has all of its properties of its element Atoms have distinct chemical properties determined by the number of subatomic particles Protons and neutrons are contained in the nucleus Electrons orbit the nucleus On the periodic table each element is placed in order by it atomic number The number of protons determines the element’s properties Electrons are held in shells Atoms are stable when their shells are filled so they sometimes share electrons to fill their shells Carbon is the fourth most common element in the universe, but the second most common element in the human body 6 elements that make up the human body Oxygen Carbon Hydrogen Nitrogen Calcium Phosphorus Sulfur Carbon forms four covalent bonds and it is a key component of the molecules of living organisms Carbon can either have 4 bonds (C6H12O6) or 2 double bonds (CO2) Carbon based molecules can be very long
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