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Modern Biology II- week 1 notes

by: Angela O.

Modern Biology II- week 1 notes BIO 1421 - 005

Marketplace > Texas State University > BIO 1421 - 005 > Modern Biology II week 1 notes
Angela O.
Texas State
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About this Document

These notes cover the scientific study of life, which will be on the first exam.
Modern Biology II
Kavita S. Kakirde
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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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