Cell Bio ch 2 - 1/17/12 Exam 4/Final: May 10th Essential...

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1/17/12 1 Exam 4/Final: May 10th Chapters: 1-14. (Frigo and Weihua- Course Review May 1st ) 15. Intracellular Compartments and Transport (Weihua) 16. Cell Communication (Weihua) 17. Cytoskeleton (Weihua) 18. The Cell Division Cycle (Weihua) 20. Cellular Communities: Tissues, Stem Cells and Cancer (Weihua) Chapter 2 Chemical Components of Cells Essential Cell Biology Third Edition Copyright © Garland Science 2010 Chemical Components of Cells • Nothing in living organisms disobeys chemical or physical laws • So…. .to understand basic cell biology we have to understand basic cell chemistry and physics Figure 2-1 Essential Cel Biology (© Garland Science 2010) The Atom Smallest particle of an element that retains its distinct chemistry
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1/17/12 2 Figure 2-2 Essential Cel Biology (© Garland Science 2010) Electrons are held in orbit by electrostatic interactions The Atom Figure 2-7 Essential Cel Biology (© Garland Science 2010) The Periodic Table Key to the Periodic Table Elements are organized on the table according to their atomic number, usually found near the top of the square. – The atomic number refers to how many protons an atom of that element has. – For instance, hydrogen has 1 proton, so it s atomic number is 1. – The atomic number is unique to that element . No two elements have the same atomic number. Figure 2-2 Essential Cel Biology (© Garland Science 2010) Electrons are held in orbit by electrostatic interactions The Atom
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1/17/12 3 Atomic Mass • Atomic Mass refers to the weight of the atom. • It is derived at by adding the number of protons with the number of neutrons. Relative mass compared to 1/12 th of C atom. This is a helium atom. Its atomic mass is 4 (protons plus neutrons). What is its atomic number? Atomic Mass and Isotopes Neutrons add stability to the atom, but don’t alter the atom’s chemistry While most atoms have the same number of protons and neutrons, some don t. Some atoms have more or less neutrons than protons. These are called isotopes . An atomic mass number with a decimal is the total of the number of protons plus the average number of neutrons. Figure 2-3 Essential Cel Biology (© Garland Science 2010) Chemistry 101 review Figure 2-4 Essential Cel Biology (© Garland Science 2010) Humans are elementally simple, but considerably different from the nonliving
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1/17/12 4 Figure 2-5 Essential Cel Biology (© Garland Science 2010) The outermost electrons are typically the business end of the atom Electrons that participate in chemical bonds are also known as valence electrons Noble gases not found in
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This note was uploaded on 01/26/2012 for the course BIOL 4374 taught by Professor Staff during the Spring '08 term at University of Houston.

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Cell Bio ch 2 - 1/17/12 Exam 4/Final: May 10th Essential...

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