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Understanding the Characteristics of Living Things

This chapter explores the fundamental characteristics that define living organisms. It outlines six key traits, including cellular composition, the ability to maintain homeostasis, reproduction methods, DNA presence, energy utilization, and growth and development. Additionally, it differentiates between asexual and sexual reproduction, emphasizing how organisms respond to external changes while maintaining stable internal environments. The information is critical for anyone studying biology or the basic principles of life.

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Understanding the Characteristics of Living Things

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Presentation Transcript

  1. Is It Alive? Notes Chapter 2 Objectives • Describe the six characteristics of of living things. • Describe how organisms maintain stable internal conditions. • Explain how asexual reproduction differs from sexual reproduction.

  2. Is It Alive? Notes Chapter 2 Living Things Have Cells • All living things are composed of one or more cells. • A cell is a membrane-covered structure that contains all of the materials necessary for life. • Some organisms are made up of only one cell and some are made up of trillions of cells. In an organism with many cells, different kinds of cells perform specialized functions.

  3. Is It Alive? Notes Chapter 2 Living Things Sense and Respond to Change • Astimulusis anything that causes a reaction or change in an organism or any part of an organism. • Homeostasisis the maintenance of a stable internal environment. • Responding to External Change Organisms must respond to change in the external environment in order to maintain their homeostasis.

  4. Is It Alive? Notes Chapter 2 Living Things Reproduce • Organisms make other organisms similar to themselves. • In sexual reproduction, two parents produce offspring that will share characteristics of both parents. • In asexual reproduction, a single parent produces offspring that are identical to the parent.

  5. Is It Alive? Notes Chapter 2 Living Things Have DNA • The cells of all living things contain the molecule deoxyribonucleic acid, or DNA. • DNA controls the structure and function of cells. • The passing of traits through DNA is called heredity.

  6. Is It Alive? Notes Chapter 2 Living Things Use Energy • Organisms use energy to carry out the activities of life. • An organism’s metabolism is the total of all of the chemical activities that the organism performs.

  7. Is It Alive? Notes Chapter 2 Living Things Grow and Develop • All living things, whether they are made of one cell or many cells, grow during periods of their lives. • Living things may develop and change as they grow.

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