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Themes of Biology

by: Zoe Lipner

Themes of Biology 1005

Zoe Lipner

Biology of Nutrition & Health

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About this Document

Notes from 8/28/14
Biology of Nutrition & Health
One Day of Notes
25 ?




Popular in Biology of Nutrition & Health

Popular in Biosystem Engineering

This 2 page One Day of Notes was uploaded by Zoe Lipner on Wednesday September 17, 2014. The One Day of Notes belongs to 1005 at George Washington University taught by Scully in Fall2014. Since its upload, it has received 117 views. For similar materials see Biology of Nutrition & Health in Biosystem Engineering at George Washington University.


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Date Created: 09/17/14
Themes of Biology 91714 503 PM Scientific Method Scientific jargon vs Everyday lingo o Hypothesis Theory o Theory Concept Hypotheses Can Be Tested Through observational studies o Variables o Descriptive o Analytical Through experimental studies o ExperimentalTreatment Group Independent variable Dependent variable o Control Group Scientists use statistics to estimate the reliability of data o Correlation a trend between changing the independent variable and the measure of the dependent variable o Causation definitiveabsoutey this causes that Common Characteristics of Cells Only a fraction of the cells in our bodies are our own Parasites and microbes make up the remainder of our body composition The evolution of eukaryotes is closely linked to their relationship wprokaryotes Certain Large Biomolecules are Common to All LifeForms The cell is the smallest and simplest unit of life o All life shares several key characteristics amp major substances Proteins Nucleic acids DNARNA Lipids Fats Carbohydrates Cells The Smallest Units of Life The cell theory is a unifying principle of bio The cell theory is based on 2 concepts 0 Every living organism is composed of one or more cells 0 All cells living today came from a preexisting cell A cell is composed of an aqueous interior enclosed in a lipidbased plasma membrane Cells have many different shapes sizes life strategies and behaviors Prokaryotes are generally singe ceed organisms Protists and Fungi can be either All members of the plant and animal kingdom are multicellular The Microscope is a Window into the Life of a Cell The iqht microscope was the first instrument that enabled scientists to view the cell Electron microscopes use streams of electrons focused w magnets to magnify specimens more than 100000x A scanning electron microscope creates a 3D view of specimen The Ratio of Surface Area to Volume Limits Cell Size Most cells are microscopic amp cannot be seen with the naked eye Prokaryotic cells are generally smaller than eukaryotic cells Cell size is limited in order to maintain a ratio of surface area to volume that allows the cell to efficiently exchange materials with the environment


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