1 / 13

Bacteria

Bacteria. Pgs. 24 - 28. Bacteria. Bacteria are the smallest and simplest organisms on the planet. They are also the most abundant. A single gram of soil can contain over 2.5 billion bacteria. The largest bacteria found were in the intestines of a surgeonfish. Classifying Bacteria.

luana
Download Presentation

Bacteria

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. Bacteria Pgs. 24 - 28

  2. Bacteria • Bacteria are the smallest and simplest organisms on the planet. • They are also the most abundant. • A single gram of soil can contain over 2.5 billion bacteria. • The largest bacteria found were in the intestines of a surgeonfish.

  3. Classifying Bacteria • Bacteria make up the kingdoms of Eubacteria and Archaebacteria. • These two kingdoms contain the oldest forms of life on Earth. • Bacteria are single-celled organisms that do not have nuclei, also called prokaryotes. • They can use cellular respiration, move around, and reproduce.

  4. Bacterial Reproduction • Most bacteria reproduce by a process called binary fission. • In binary fission the DNA is copied and attaches to the cell membrane. • The membrane grows longer and the loops of DNA become separated. • When the cell is big enough the membrane pinches inward and separates into two cells.

  5. Endospores • Bacteria reproduce at warm, moist environments. • If the environment is not favorable, the bacteria doesn’t survive or can row a thick protective membrane called an endospore. • Endospores can survive boiling, freezing and dry environments.

  6. When conditions are right the endospore can break open and become active again. • Some endospores have been found in the digestive tract of an insect preserved in amber for 30 million years.

  7. Shape of Bacteria • Almost all bacteria have a rigid cell wall that gives it a shape. • Bacilli are rod shaped bacteria • Cocci are spherical bacteria • Spirilla are lone spiraled shaped bacteria • Some bacteria have hair like structures called flagella to help them move.

  8. Eubacteria • Most bacteria are in the kingdom Eubacteria. • This has more individual organisms than any other kingdom and existed for 3.5 billion years. • Most eubacteria are consumers, decomposers parasites, and producers. • Some contain chlorophyll to make their own food.

  9. Cyanobacteria • Cyanobacteria are possibly early relatives to plants. • They live in water environments like hot springs. • They could have lived inside cells with nuclei billions of years ago.

  10. Archaebacteria • This bacteria lives in places where no other living things are found. • Ex. Hot springs and beneath 430m of ice. • The cell walls of archaebacteria (when they have them) are chemically different that other organisms with cell walls.

  11. There are three main types of archaebacteria: methane makers, heat lovers, and salt lovers. • Methane makers make methane and are found in swamps. • Heat lovers are found in ocean rift vents that over 360 degrees Celsius. • Salt lovers are found in areas of high salt concentration like the Dead Sea.

More Related