Bilogy

Chapter 1 Concepts and Methods in Biology I. What is Life? There is not a enclothe definition for life Life is high hat described by characteristics associated with life history organisms. Characteristics of life come in Living organism have a knotty organization. decree or Homeostasis relatively constant internal conditions. wont of hormones & receptors to save body levels normal Growth and knowledge pattern of crop and development characteristic of species. Energy utilization energy intake and transformation to perform all activities. ATP energy atom of life Response to the Environment response to stimuli. Reproduction, growth and development Ensures continuance of species. We inherit certain traits through deoxyribonucleic acid DNA (deoxyribonucleic sultry) is the molecule of life. Mutations - transforms in DNA that vary traits Evolving Ability to change over time. changing over a period of ti me due to the immanent weft of adaptive traits Adaptive traits: function & reproduce Natural alternative: nature Artificial selection: breeding II. Are com localiseer viruses live? Examples of Nonliving Entities A virus is a non-cellular infectious gene Viruses harp of a protein surface surrounding a nucleic acid either DNA or ribonucleic acid but neer both.

Viruses cannot reproduce themselves. Bacteriophages A theme of viruses that infect bacterial cells and atomic number 18 very useful in studies. 5 Basic go in Viral counter 1. Attachment Virus attaches to host cell 2. Penetration all told or part (usually DNA/RNA) ente rs the cell. 3. Replication & synthesis ! The viral DNA/RNA directs the host cell into making bright viral parts. 4. Assembly The viral parts are put together to form new viruses. 5. Release New viruses are released from the cell when the cell is stressed. III. DNA and Energy DNA oAll organisms consist of one or more cells....If you motivation to get a full essay, order it on our website: OrderEssay.net

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