Bio exam 1 study guide - Study Guide for Exam 1 This list...

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Study Guide for Exam 1 This list of questions and statements is NOT exhaustive; it should not be the only studying you do for the exam, but it’s a good place to start. It may be beneficial to ponder and craft answers to these questions, and then get together with a study group to compare your answers. Vocabulary – define and explain the significance of terms that were used in lecture. Things to know and think about – Chemistry of Life : 1. Draw and label the basic structure of an atom. 2. Name and describe of each of the three subatomic particles. -protons(+), electrons(-),neutrons 3. Determine the number of electrons in the outermost electron shell (if given a periodic table) for the major elements in all living organisms and determine the way in which atoms are likely to interact with other atoms based on number of electrons. -Nitrogen(3), Oxygen(2), Carbon(4), Hydrogen(1) 4. Which elements are important in living organisms? All organic life is based on one major element , what is it? - All life is made up of cells and all cells come from preexisting cells. The 4 major elements anr Carbon, Hydrogen, Nitrogen and Oxygen 5. Explain how and why covalent, ionic, and hydrogen bonds form, and how they differ from one another; be able to draw or recognize different bonding patterns. -Ionic bonds are formed when one atom with a higher electronegativity takes an electron from an atom with low electronegativity. -Covalent bonds can be either polar or non-polar depending on how the electrons are shared. If the electrons are shared evenly then it is a non-polar covalent bond. If the electrons are not shared evenly, then it is a polar covalent bond. -Hydrogen bonds 6. Explain why some covalent bonds are symmetrical and others are asymmetrical (polar). Which of the four most abundant elements are more likely to form asymmetrical bonds? - Some covalent bonds are symmetrical because the 2 atoms sharing the electrons have similar electronegativity, whereas asymmetrical requires one atom to have higher electronegativity than the other.
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