Modern Biology II- week 1 notes
Modern Biology II- week 1 notes BIO 1421 - 005
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This 3 page Class Notes was uploaded by Angela O. on Friday September 2, 2016. The Class Notes belongs to BIO 1421 - 005 at Texas State University taught by Kavita S. Kakirde in Fall 2016. Since its upload, it has received 14 views.
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Date Created: 09/02/16
Modern Biology II Week 1 Wooly mammoths shouldn’t be brought back to life because: It would be hard for them to survive in the warmer conditions of today Scientists would need their exact DNA to successfully bring them back They would have to implant their DNA into alreadyexisting animals Measles: Caused by virus Numbers of people with measles were dropping, but now they’re rising again Less people getting vaccinated, therefore more people with measles Objective vs. Subjective: Objective o Science helps answer questions by research and polls o Ex. “What is the most common car that people drive?” Subjective o Cannot be answered based on science, depends on personal opinions o Ex. “What is the best book ever written?” Being a scientist is like being a detective; detectives use science to answer questions about crimes while scientists use science to answer questions about the natural world. Probiotic several kinds of microorganisms, needed when taking lots of antibiotics Science= the study of the natural world and its phenomena Not a collection of facts Lots of data supporting scientific evidence Cannot answer subjective questions The scientific method: A logical hypothesis o Must be testable o Asks a question based on observation Prediction o If/then statement Collect and interpret data o Experiment or observation Draw conclusions o Did you support hypothesis? Everything gathered is then published and up for review Peer review o Other scientists evaluate data and conclusions A good experiment Only test ONE variable o Rule out confounds Use controls o Which prevents confounds Abiogenesis vs. biogenesis Abiogenesis o Living arrives from nonliving matter Biogenesis o Living arrives from preexisting matter/life See experiment of Francesco Redi In science, repeatability is essencial. Facts: describe things Theories: explain things Common theories: Cell theory o All organisms composed of cells Evolution o Populations change over many generations due to natural selection o All organisms derived from preexisting organisms Scientific theory an explanation about something in the natural world that: Repeatedly tested Wellsupported Uses facts Starts out as hypothesis Lots of data and evidence support it Pseudoscience: scientificsounding claims mistakenly regarded as being based on the scientific method, not supported by trustworthy studies Biology: the study of life How do we know if something is living? Organized o All living things made up of atoms o Atoms make up molecules, which make up cells, etc. o Levels of organization: Biosphere, ecosystem, community, population, organism Requires energy and nutrients o Repair old cells and build new ones o Reproduction o Sun is the source of all energy o Energy is passed down from one level to the next Maintains internal constancy o Homeostasis process by which an organism maintains equilibrium, even as the environment changes o Ex. Blood pressure, pH, etc. Responds to stimuli o External light, sound, chemicals, etc. o Internal low sugar, pain, etc. Reproduces, grows, and develops o Develop into adulthood o Transmits DNA from generation to generation Evolves o Change of genetic makeup of a population over multiple generations o Natural selection o Over production o Variation o Selection o Adaptation Biology is important for all people to understand many important health, social, medical, environmental issues relying on scientific theories. Prokaryoticno nucleus Eukaryotic new nucleus Three domains: Bacteria, Archaea, Eukarya
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