Biology Revisited :: essays research papers

Concepts and Methods in BiologyBiology RevisitedA. What is life?1. Experience and education refine our questions and our answers.2. turn the meaning of "alive."3. This book is biology revisited. It will providea. Deeper understanding.b. A more than organized level of understanding.B. To biologists, life reflects its ancient molecular origins and its degree of system. career is1. A way of capturing and using cypher and materials.2. A way of perception and responding to specific changes in the environment.3. A qualification to reproduce, grow, and develop.4. Capable of evolving.I. DNA, Energy, and LifeA. goose egg Lives Without DNAl. liveliness and nonliving matter are sedate of the similar leaveicles, operating check to laws governing energy.a. Deoxyribonucleic acid, or DNA, is the special molecule that sets the living world away from the nonliving.b. DNA carries the hereditary instructions for assembly of proteins.2. Each beingness is part of a reproductive con tinuum that extends back through countless generations.a. Each organism arises through reproduction in which DNA instructions are catching from parents to offspring.b. DNA also guides development of a fertilized egg into a multicelled organism.B. Nothing Lives Without Energy1. Energy, the capacity to do work, is transferred throughout the universe.2. Metabolism refers to the cells capacity to extract and convert energy from its surroundings and use energy to go for itself, grow, and reproduce.a. Plants acquire energy from sunlight and transfer some of the energy into ATP.b. fundamental the assembling and tearing down of biological structures are energy transfers.3. Organisms tooshie sense changes in the environment and make controlled responses to them.a. Receptors detect specific culture about the environment.b. Special cells receive stimuli and make appropriate responses.c. Homeostasis is the maintenance of a tolerable internal environment.II. Energy and Lifes OrganizationA. Levels of Biological Organization1. The cell, composed of "biological molecules," is the basic unit of life.4. Multicelled organisms have increasingly complex levels of organization that result in tissues >>> organs >>> organ systems >>> organisms >>> populations >>> communities >>> ecosystems >>> biosphere. B. Inter weighencies Among Organisms1. Energy flows from the sun.a. Plants (producers) trap this energy by photosynthesis.b. Animals (consumers) feed on the stored energy in plants, using aerobic respiration.c. Bacteria and fungi (decomposers) break down the biological molecules of other organisms in order to recycle raw materials.2. All organisms are part of webs that depend on one another for energy and raw materials.III. If So a lot Unity, Why So Many Species?A. All organisms are made of the same materials and function according to the same laws of energy.