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Chapter 1, Section 1

by: Julia Reis

Chapter 1, Section 1 BSC 105

Marketplace > marshall > Biology > BSC 105 > Chapter 1 Section 1
Julia Reis

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About this Document

These notes cover Chapter 1 (Exploring Life and Science), Section 1 (The Characteristics of Life).
Human Biology
Frank R. O'Keefe
Class Notes
Biology, HumanBiology, Chapter1Section1, TheCharacteristicsofLife, ExploringLifeandScience, BSC105




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This 3 page Class Notes was uploaded by Julia Reis on Wednesday August 17, 2016. The Class Notes belongs to BSC 105 at marshall taught by Frank R. O'Keefe in Fall 2016. Since its upload, it has received 17 views. For similar materials see Human Biology in Biology at marshall .


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Date Created: 08/17/16
Julia Reis Chapter 1: Exploring Life and Science 1.1The Characteristics of Life Biology (pg. 2): the study of living organisms and their environments.  Living things are organized, acquire energy and materials, homeostatic, respond  to stimuli, grow and reproduce, and have evolved.  a) Life is Organized   The level of organization are as follows:  1. Atoms (pg. 2) (smallest unit made of electrons, protons, and neutrons),  2. molecules (pg. 2) (two or more atoms),  3. cells (pg. 2) (unit of living things),  4. tissue (pg. 2) (cells with a common function/structure),  5. organ (pg. 2) (tissues working together),  6. organ system (pg. 2) (organs functioning together),  7. organism (pg. 2) (individual with an organ system),  8. population (pg. 2) (same species [interbreeding group] within an area),  9. community (pg. 2) (multiple species within an area), 10. ecosystem (pg. 2) (community and environment of an area),  11.biosphere (pg. 2) (regions of earth with living organisms)  a) Organisms Acquire Materials and Energy Organisms receive energy and materials from the food that they eat and the sun. Metabolism (pg. 4): chemical reactions in a cell Photosynthesis (pg. 4): convert energy from the sun into chemical energy b) Organisms Maintain Homeostasis Humans maintain homeostasis as the cardiovascular system working to keep the temperature at a normal range.  Homeostasis (pg. 4): a cell/organism keeping the internal environment within  conditions c) Organisms Respond to Stimuli Organisms respond to outside stimuli such as pulling a hand back after touching  something hot.  Julia Reis d) Organisms Reproduce and Grow Reproduce (pg. 4): to produce a new organism Growth (pg. 5): increase in cells and size Development (pg. 5): changes from egg being fertilized to death.  Genes (pg. 5): sequences of hereditary material that provide information about  certain traits. Deoxyribonucleic acid (DNA) is contained in genes.  Mutations (pg. 5): variations in genes e) Organisms Have an Evolutionary History Evolution (pg. 5): population changes over time Natural Selection (pg. 5): variation causes some organisms to survive and  reproduce. The variation then becomes an adaptation (pg. 5) (modification  suitable to the environment). Learning Outcomes (pg. 2): 1. Explain the basic characteristics that are common to all living things. (pg. 2)  Living things are organized, acquire energy and materials, homeostatic,  respond to stimuli, grow and reproduce, and have evolved.  2. Describe the levels of organization of life. (pg. 2 and 3) Atoms, molecules, cells, tissue, organ, organ system, organism,  population, community, ecosystem, biosphere.  3. Summarize how the terms homeostasis, metabolism, development, and  adaptation all relate to living organisms. (pg. 4 and 5) Homeostasis keeps internal state within a suitable range. Metabolism is  the chemical reaction within cells. Development is the changes between  egg fertilization to death of an organism. Adaptation is the modification of  an organism to interact better in an environment.  4. Explain why the study of evolution is important in understanding life. (pg. 5  and 6) Evolution is important to understand the unity and diversity of organisms.  They share characteristics of life but adapt in different ways.  Check Your Progress: (pg. 6) Julia Reis 1. Describe the basic characteristics of life. (pg. 2) Living things share these six basic characteristics: they are organized, acquire  energy and materials, are homeostatic, respond to stimuli, grow and reproduce,  and evolve.  2. Summarize the levels of biological organization. (pg. 2) The levels of biological organization are: atom, molecule, cell, tissue, organ,  organ system, organism, population, community, ecosystem, and biosphere. 3. Explain the relationship between adaptions and evolutionary change. (pg. 5) Certain variations among species will help the organism survive and reproduce.  This variation is then an adaptation that allows the organism to interact in the  environment with more success. Over time the species will undergo evolutionary  change as the organisms without this variation become less common throughout  the generations. 


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