Biology 101 - Chapter 1 Notes

Biology 101 - Chapter 1 Notes - Biology 101 Chapter 1...

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Biology 101- Chapter 1 Exploring Life I. Biology’s Most Exciting Era a. Some Properties of Life 1. O rder- ex. Sunflower close-up 2. E volutionary Adaptation- ex. Camouflages organisms take. These adaptations evolve through reproductive success of individuals who are best-suited to their environment. 3. R esponse to the Environment- ex. Venus’ flytrap closing due to stimulus of a fly. 4. R egulation- ex. Regulation of blood flow in ears of a jackrabbit of human. Maintains constant body temp. 5. E nergy Processing- ex. Hummingbird obtaining fuel from nectar. Chemical energy in food powers work. Food is fuel for humans, also. 6. G rowth and Development- ex. Inherited info. carried by genes controls growth and development. 7. R eproduction- ex. Organisms reproduce own kind. II. Biologists explore life from the microscopic to the global scale. a. A Hierarchy of Biological Organization 1. Molecules- Chemical structure which has >2 atoms Ex. Chlorophyll of a maple leaf (pigment molecule, makes leaf green). *One of most important molecules *Absorbs sunlight during 1 st step of photosynthesis 2. Organelles- Various functional components that make up cells Ex. Chloroplasts 3. Cells- Life’s fundamental unit of structure and function *Amoebas and most bacteria are single cells *Plants and animals are multicellular *Cells take on different duties in an organism Ex. In a human muscle cells and nerve cells perform different functions in specialized tissue 4. Tissues- Groups of similar cells Ex. Honeycomb tissue in a leaf is the location of photosynthesis, the process that converts light energy to the chemical energy of sugar and other food. Ex. Epidermis, skin of a leaf. *Pores allow CO 2 , a raw material for sugar production, to reach photosynthetic part of leaf. 5. Organs and Organ Systems- A body part consisting of >2 tissues Ex. Maple leaf, stems, roots, brain, kidney *Human organs are combined in organ systems
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6. Organisms- Individual living things Ex. Maple trees, frogs 7. Populations- All the individuals of a species living within the bounds of a specified area. Ex. In a forest is a pop. of sugar maple trees and a pop. of black bears. 8. Communities- The set of populations that inhabit a particular area. Ex. In a forest includes animals, trees and plants, etc. *Forms of life in a community are known as species 9. Ecosystems- All the living things in a particular area, along with all the nonliving components of the environment with which life interacts, such as soil, water, atmospheric gases, and light. Ex. Deciduous forests (deciduous trees are trees that lose their leaves in 1 season and grow new ones in another), grasslands, deserts 10. The Biosphere- All the environments on Earth that are inhabited by life. Ex.
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Biology 101 - Chapter 1 Notes - Biology 101 Chapter 1...

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