1.1 Cell Theory - missgillett.weebly.com · Comparethecharacteristicsoflivingandnon-livingthings....
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CELL THEORY CELLS AND MICROORGANISMS
Transcript of 1.1 Cell Theory - missgillett.weebly.com · Comparethecharacteristicsoflivingandnon-livingthings....
CELL THEORYCELLS AND MICROORGANISMS
Compare the characteristics of living and non-living things.
Understand that living things are made up of one or morecells.
Know that cells:• are the structural and functional units of life• come from pre-existing cells• contain hereditary material
The cell membrane defines a cell; it separates the cell fromits surroundings.
Overview
What makes something living?
Work in small groups to create a list of requirements to classify something as living or non-living.
Activity
Earth is the only known planet that sustains life.
“Life” refers to the vast diversity of living things which inhabitthe planet.
Biology is the study of living things!
Living and Non-Living Things
Living things must show all of the following characteristics:
MOVEMENT
RESPIRATION (energy production)
SENSITIVITY (detecting and responding to changes)
GROWTH (the ability to make more cells)
REPRODUCTION (the ability to pass on genetic info)
EXCRETION (removal of wastes)
NUTRITION (take in and use appropriate nutrients)
Living Things
INTENDED STUDENT LEARNING
Compare the characteristics of living and non-living things.
INTENDED STUDENT LEARNING
Compare the characteristics of living and non-living things.
Complete the following table to show why each of these organisms is considered to be alive.
Activity
Living? Picture Movement Respiration Sensitivity Growth Reproduction Excretion Nutrients
Koala
Whale Shark
Tree
Euglena
Complete the workbook questions in your books.
Questions
A theory starts as a hypothesis. If there is enough evidence tosupport the hypothesis it becomes a theory - an accepted andvalid explanation.
The Cell Theory describes the properties of cells.
Cell Theory
Robert Hooke was the first to describe the cell, and publishedhis observations in his book, Micrographia, in 1670.
Hooke sliced a piece of cork and noticed the structural unitsunder his microscope.
He called these structures ‘cells’ (small rooms).
Cell Theory
Leeuwenhoek (1674) was the first to observe live cells,including red blood cells.
Cell Theory
The Cell Theory states:• All living organisms are composed of one or more cells.• The cell is the basic structural and functional unit of life.• All cells arise from pre-existing cells by cell division.
Modern Cell Theory added more points after advancement incytology and molecular biology:
• There is a flow of energy in cells.• The cell contains hereditary information (DNA) which is passed on
during cell division.• All cells are basically the same in chemical composition (molecules,
ions, and atoms).
Cell Theory
Cell History
INTENDED STUDENT LEARNING
Understand that living things are made up of one or more cells.
INTENDED STUDENT LEARNING
Know that cells:• are the structural and functional units of life• come from pre-existing cells• contain hereditary material
The cell membrane is responsible for controlling what entersand exits the cell. It is approximately 8 nanometres thick.
The membrane is comprised of a phospholipid bilayer and isimportant in maintaining the internal environment of a cell. Ifthere was no control over the environment, the cell would diequickly.
The Cell Membrane
Fluid Mosaic Model
INTENDED STUDENT LEARNING
The cell membrane defines a cell; it separates the cell from its surroundings.
Homework
Independent content revision
Workbook questions
