Cells are the basic structural and functional unit of life. This module traces the discovery of the cell in the 1600s and the development of modern cell theory. The module looks at similarities and differences between different types of cells and the relationship between cell structure and function.
http://www.visionlearning.com/en/library/Biology/2/The-Discovery-and-Structure-of-Cells/64
Cell Membrane (also known as plasma membrane or plasmalemma) is surrounds all cells. It: 1) separates the inner parts of the cell from the outer environment; and 2) acts as a selectively permeable barrier to allow certain chemicals, namely water, to pass and others to not pass.
http://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookCELL1.html
In addition to these, photosynthetic (plant) cells will have a cell wall, chloroplasts, and a central vacuole. Prokaryotic cells, however, do not contain any membrane-bound organelles. Instead, they can include plasmids, a cell wall, and in the case of photosynthetic prokaryotes, thylakoids.
http://www.visionlearning.com/en/library/Biology/2/The-Discovery-and-Structure-of-Cells/64
Figure 1. Ingredients used in Miller's experiments, simple molecules thought at the time to have existed on the Earth billions of years ago. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission. Figure 1.
http://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookCELL1.html
Organelles are formed bodies within the cytoplasm that perform certain functions. Some organelles are surrounded by membranes, we call these membrane-bound organelles. Ribosomes are the tiny structures where proteins synthesis occurs.
http://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookCELL1.html
2.1.1 Outline the cell theory. The cell theory states that: All living organisms are composed of cells. Multicellular organisms (example: humans) are composed of many cells while unicellular organisms (example: bacteria) are composed of only one cell. Cells are the basic unit of structure in all organisms. Cells are the smallest unit of life.
http://ibguides.com/biology/notes/2.1-cell-theory
The smallest human cells, sperm cells, are a few micrometers wide (1/12,000 of an inch), whereas the longest cells, the neurons that run from the tip of the big toe to the spinal cord, are over a meter long in an average adult.
http://www.visionlearning.com/en/library/Biology/2/The-Discovery-and-Structure-of-Cells/64
All cells contain genetic material in the form of DNA that is passed from the parent cell to the two daughter cells. However, in prokaryotes that genetic material is in a circular form, while in eukaryotes the genetic material is in linear strands.
http://www.visionlearning.com/en/library/Biology/2/The-Discovery-and-Structure-of-Cells/64
A layer of phospholipids and proteins that forms a barrier between the inside of the cell and the outside environment. Cell Wall. Found in plants, fungi, and some protists, a structure outside of the plasma membrane that provides strength, support, and protection.
http://www.visionlearning.com/en/library/Biology/2/The-Discovery-and-Structure-of-Cells/64
2.1.2 Discuss the evidence for the cell theory. When scientists started to look at the structures of organisms under the microscope they discovered that all living organisms where made up of these small units which they proceeded to call cells.
http://ibguides.com/biology/notes/2.1-cell-theory
which is evidence for the idea that cells are the basic units of life?
The discovery of the cell in the 1600s and the development of modern cell theory are the evidences for the idea that cells are the basic units of life The discovery of the cell in the 1600s and the development of modern cell theory is evidence for the idea that cells are the basic units of life.