Genetically Modif ied Foods
Man has been "genetically modifying" everything from food to dogs for many centuries; but in the past, the only tool has been selective breeding (NOVA, 2001). For example, if you wanted to create a breed of wheat with resistanc
- Contains most of the genes in
the eukaryotic cell
- Some genes are located in
mitochondria and chloroplasts
- Has pores within the
membrane to allow large
macromolecules to pass.
When a cell prepares to
Carbon: The Backbone of Life
Carbon enters the biosphere through the action of plants
Carbon has the ability to form molecules that are large, complex, and diverse and this
molecular diversity made organism diversity possible
The non-carbon elements u
To study cells biologist use microscopes and the tools of biochemistry
Types of microscopes
Light microscopes visible light is passed through the specimen and then through a glass
The lenses refract (bend) the light in such a way that the imag
The Key Roles of Cell Division
The continuity of life is based on the reproduction of cells, cell division.
Plays several important roles in the life of an organism
A single division of a unicellular organism reproduces the entire organism.
Can produce p
The Molecules of Life
Cells join smaller organic molecules together to form larger molecules.
These larger molecules are called macromolecules.
Four major classes of macromolecules (carbohydrates, proteins, lipids, and nucleic acids)
Three of these f
Catabolic pathways yield energy by oxidizing organic fuels
Catabolic pathways and production of ATP
With the help of enzymes, a cell systematically degrades complex organic molecules that are
rich in potential energy to simpler waste products that have