Biology in Focus, Preliminary Course Glenda Childrawi and Stephanie Hollis

Outcomes By the end of this Module you should be able to: Describe how organisms are make of cells with similar structural characteristics Explain how cell membranes control the movement of materials into and out of cells Describe how differentiated cells preform specialised functions in multicellular organisms Explain how the maintenance of organisms requires growth and repair

Outcomes Prepare microscope slides and use a microscope Interpret both the view through a microscope and images from electron micrographs Gather, process and analyse information from secondary sources Plan and carry out open-ended investigations

Part of the Patterns in Nature Module Biology in Focus, Preliminary Course Glenda Childrawi and Stephanie Hollis Cells and the cell theory Topic 1: Introduction to Cells and Cell Theory

DOT POINT Organisms are made of cells that have similar structural characteristics. brisbaneinsects.com

Introduction Up until 400 years ago, objects that were to small to be seen with the naked eye could not be examined. The study of living things was popular, but at a macroscopic level (based on what could be viewed with the naked eye). Before this, living things had not been considered at a cellular level davidselvam.blogspot.com

Introduction Biologists at the time were called ‘natural scientists’ suggesting a broad study of nature. Today biologists study living things at a macroscopic and microscopic level and even at a molecular level. This began with the discovery of the microscope pballew.blogspot.com

Characteristics of Living Organisms Today most people accept the idea that all living things are made of one or more unites called cells. This is the most basic characteristic of living things and currently termed ‘The Cell Theory’ singularityhub.com

Characteristics of Living Organisms The Cell Theory States that: 1. All living things are made of cells 2. Cells are the basic structural and functional unit of organisms 3. All cells come from pre-existing cells emc.maricopa.edu

Characteristics of Living Organisms Certain characteristics or life functions are common to all living things. Living things are made of one or more cells and they can: Reproduce Grow Move Respire Excrete Respond to stimuli Obtain nutrients die tweed.nsw.gov.au

Characteristics of Living Organisms Reproduce: Produce offspring that resemble the parents Grow: Increase in size ryliesbloger.blogspot.com

Characteristics of Living Organisms Move Even plants can make some small movements such as opening and closing petals Respire Produce chemical energy by taking in oxygen and combining it with sugar, giving out carbon dioxide as a by- product botany.org

Characteristics of Living Organisms Excrete Get rid of wastes such as carbon dioxide Respond to Stimuli in the environment, such as moving towards food or growing towards light poopingpets.com

Characteristics of Living Organisms Obtain nutrients EAT Duh!! ;) Die Death is when all of the above functions cease mimsies.wordpress.com

Homework Answer the following questions in your notebook. Be prepared to discuss next lesson. 1. State the cell theory 2. Become familiar with the ‘Timeline: A short history of biology. Handout