1 / 23

What is Biology? What is Life?

Discover the seven common characteristics of life, including being made of cells, maintaining internal environment, passing on traits, performing chemical activities, growing and developing, responding to stimuli, and reproducing.

ekristin
Download Presentation

What is Biology? What is Life?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What is Biology?What is Life?

  2. All this creates a Question: What is Life?

  3. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells.

  4. Cells • All living things are made of one or more cells. • A cell is the smallest unit capable of all life processes

  5. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells. • Living things maintain their internal environment.

  6. Homeostasis • All living organisms must maintain a stable internal environment in order to function properly. • The maintenance of a stable internal environment in spite of changes in the external environment is called homeostasis.

  7. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells. • Living things maintain their internal environment. • Living things pass on their traits.

  8. Heredity & Evolution • When an organism reproduces, it passes on its own traits to its offspring in a process called heredity. • Inherited characteristics change over generations. This process is called evolution

  9. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells. • Living things maintain their internal environment. • Living things pass on their traits. • Living things perform chemical activities. This is known as metabolism.

  10. Metabolism • Living organisms carry out different chemical reactions in order to obtain energy. • The sum of all the chemical reactions carried out in an organism is called metabolism. • Almost all of the energy used by living things originally comes from the sun.

  11. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells. • Living things maintain their internal environment. • Living things pass on their traits. • Living things perform chemical activities. This is known as metabolism. • Living things growanddevelop.

  12. GrowthandDevelopment • All living organisms grow. • As organisms grow, many change. This process is called development. • Development differs from evolution because development refers to change in a single individual during that individual’s life.

  13. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells. • Living things maintain their internal environment. • Living things pass on their traits. • Living things perform chemical activities. This is known as metabolism. • Living things growanddevelop. • Living things respond to a stimulus.

  14. Response to Stimuli • In addition to maintaining a stable internal environment, living organisms respond to their external environment. • Can you think of a way that you have responded to your environment today?

  15. Characteristics of Life • All life has seven characteristics in common: • Living things are made of cells. • Living things maintain their internal environment. • Living things pass on their traits. • Living things perform chemical activities. This is known as metabolism. • Living things growanddevelop. • Living things respond to a stimulus. • Living things reproduce.

  16. Reproduction • Most living things can reproduce. Reproduction is the process by which organisms make more of their own kind from one generation to the next.

  17. The Cell Theory • All living things are composed of cells. • Cells are the basic units of structure and function in living things. • New cells are produced from existing cells.

  18. Cells Timeline • Robert Hooke (1665): studied cork; saw tiny, regular shaped “boxes”; called them cells. • Matthais Schleiden (1838) • All plants are made of cells • TheodorSchwann (1839) • All animals are made of cells • Rudolf Virchow (1855) • Concluded all cells come from other cells Go to Section:

  19. What is a VIRUS?? • Is it ALIVE????

  20. Slide # 4 Viruses are 1/1000 to 1/10,000 the size of our cells.

  21. Slide # 5 What is a Virus? Classified as non-living: • are not made up of cells • Cannot live independently • can not reproduce on their own • Does not require food/does not grow, develop or move

  22. Viruses are Nonliving • Viruses are parasites of cells. • Do not have all eight characteristics of living things so they are classified as nonliving. • Characteristics of Living Things 1.)Made up of cells 2.) Must reproduce 3.) Must be based on a universal genetic code 4.) Must grow and develop 5.) Must obtain and use materials and energy 6.) Must respond to their environment 7.) Must maintain a stable environment 8.) Must change over time

  23. Slide # 7 Capsid Tobacco Mosaic Virus Cold virus Flu virus Bacteriophage virus Viruses consist of: • Nucleic acid: DNA or RNA (inner core) • Protein Coat, called a Capsid

More Related