Chapter 1 - Chapter 1 Studying Life I What is Biology...

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Chapter 1 Studying Life I. What is Biology? Biology : the scientific study of living things Living things : all the organisms descended from a single-celled ancestor. Characteristics of living organisms : Consist of one or more cells Contain genetic information Use genetic information to reproduce themselves Are genetically related and have evolved Can convert molecules from their environment into new biological molecules Can extract energy from the environment and use it to do biological work Can regulate their internal environment Evolution : a central theme Living systems evolve through differential survival and reproduction. Unicellular organisms : a single cell carries out all the functions of life Multicellular organisms : made of many cells that are specialized for different functions Cell Theory: Cells are the basic structural and physiological units of all living organisms. Cells are both distinct entities and building blocks of more complex organisms. (Schleiden and Schwann 1838) All cells come from preexisting cells. All cells are similar in chemical composition. Most of the chemical reactions of life occur within cells. Complete sets of genetic information are replicated and passed on during cell division. Charles Darwin proposed that all living organisms are descended from common ancestors. Evolution by natural selection Species: a group of organisms that look alike and can breed successfully with one another. Humans
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Chapter 1 - Chapter 1 Studying Life I What is Biology...

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