PLS 150 Week 1 Notes
PLS 150 Week 1 Notes PLS 150
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This 3 page Class Notes was uploaded by Chelsea Opong-Wadeer on Thursday September 22, 2016. The Class Notes belongs to PLS 150 at University of Rhode Island taught by Nathaniel Mitkowski in Fall 2016. Since its upload, it has received 18 views. For similar materials see Plants, People and the Planet in Plant Science at University of Rhode Island.
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Date Created: 09/22/16
PLS 150 9/9/16 What is Biology? Chemistry + Physics + C = Bio o Or the study of life Chemistry and physics created when the Universe came into existence. C= carbon, the most important atom on Earth o All the life on Earth is here b/c of Carbon The Big Bang: The Universe started from a single, infinitely dense point 13.7 billion years ago All matter created in this universe Everything expanded outward o still doing this to this day Chemistry and Physics: Chemistry is the study of how molecules and atoms interact Physics is the study of how matter behaves o Use physical characteristics to study chemistry Life is made of matter Life is dependent upon chemical reactions and follows physical laws What about Carbon? Atoms are the building blocks of matter, or elements o Everything is made up of atoms Carbon is the most important element, basis of all life th Carbon has special properties and is the 4 most common element in the Universe o We are carbon based life o About 90% of molecules in our body are carbon Atoms: Single atoms are the smallest unit of any element o This is why it's important Atoms can be divided but are then just generic particles When atoms combine, molecules are formed Molecules can be very small or very large Types of bonds: 1. Covalent o Atoms are bonded to form molecules o Very strong or weak - bonds o Strongest bond type – covalent o Generally will not fall apart easily and require energy to break Like a divorce, can be done, but requires a lot of time and energy o Sharing electrons between atoms 2. Ionic a. Very weak b. Ions are atoms with charge (+ or -) c. Just like teeney-tiny magnets d. Fall apart in water or when they come in contact with other ions e. Not stable without other ions i. Like a one night stand – doesn't usually stick around when it's all over f. All salts are ionic i. Ionic= definition of salt g. Giving up and getting electrons between atoms, to form little magnets 3. Hydrogen a. Super weak b. Molecules act like magnets – this is the difference between Hydrogen/ionic bonds c. Molecule acts like it has two charges – positive and negative i. Called dipolar molecules d. Assemble and disassemble a million times a second, "sticky" bond e. More attraction than bond f. Water has two sides that stick to opposite sides of other water molecules Reactions: Atoms and molecules combine Atoms and molecules break apart These changes happen in reactions A reaction is simply the creation or destruction of bonds Making and breaking bonds uses energy Why do we care? Isn't this a botany/biology class? Because life is contingent upon molecules, charges, bonds and energy Every second a million chemical reactions take place inside you Every thought, every word, every breath The same is true for plants
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