Exam1 Review (Answers)

Exam1 Review (Answers) - Kierste Miller Tues Discussion...

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Kierste Miller Tues Discussion Exam 1 Review Lecture #1: Definition and chemical basis of life Requirements of Life: Sexual & asexual reproduction – Gametes + miosis Metabolism – Derivation of energy from fod to fuel cellular processes Growth – Replicate themselves to form new organic material for new living cells Properties of Life: Order – working of cell, life, etc. is not random Reproduction Growth and development Energy utilization – metabolism, to perform cellular tasks Response to the environment – plants stretch towards light, organisms move to reproduce Homeostasis – ability to maintain an internal environment (ex: blood glucose level, body temp) Evolutionary adaptation – across generations, species adapt, some are man made adaptations (broccoli)) Cell Theory – ( 1839) very new idea, supports the idea that all organisms are very closely related Definition of a cell – The simplest collection of matter that exhibits requirements of life Components common to all cells: Plasma membrane – encloses the cytoplasm; regulates the passage of molecules into and out of the cell DNA – hereditary molecules; blue print for protein synthesis Ribosomes – site of protein synthesis Main cell types: prokaryotes: first evidence of life 3.5 bya (Ex: bacteria, archaea) Traits – no nucleus (DNA is not contained in a nucleus); no membrane bound organelles; contains only 1 molecule of single circular chromosome DNA eukaryotes: basically everything but bacteria and archaea (Ex: plants, fungi, animals, protists) Organelles – membrane bound organelles Traits – nucleus; more than one molecule of linear chromosomes of DNA Chemical Basis of Life Elements – specific properties that cannot be broken by ordinary chemical reactions; made up of the same kind of atoms Atoms – smallest matter retains elemental properties Molecules Protons - # protons = # electrons Electrons – absorb energy to jump into outermost orbits; emit energy to return Anion – negative ion Cation – positive ion Compounds – substance containing 2 or more elements in a precise and fixed pattern Chemical bonds: ionic bonds - salts covalent bonds – strong, shared hydrogen bonds - FON Van der Waals interactions – attraction due to movement of electrons Reactions: exergonic reactions – reaction in which energy is released (ex: fire, respiration)
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Kierste Miller Tues Discussion Exam 1 Review endergonic reactions – reaction when energy is captured. Products have more energy (ex: photosynthesis) respiration – glucose + oxygen, when they release energy, produce carbon dioxide + H2O photosynthesis – carbon dioxide + H2O, when the sun hits, produce glucose + oxygen Organic molecules – contain C, H; functional groups inorganic molecules – no C; minerals, CO2, H2O Properties of water: Density – solid less dense than liquid, or else rivers would kill! Cohesion –
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Exam1 Review (Answers) - Kierste Miller Tues Discussion...

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