test 2 Flashcards
1
Q
2nd law of thermodynamics
A
The amount of useful energy decreases when energy is converted from one form to another.
2
Q
four ways cells regulate mataboism
A
- Regulate enzyme availability.
- Some must be “switched on” to be active.
- Molecules bind to enzymes and enhance/inhibit activity (allosteric regulation).
- Adequate amounts of formed product inhibit enzyme activity
3
Q
four principles of cell theory
A
- all organisms are composed of one or more cells, within which the process of life occurs.
- cells are the smallest living things. nothing smaller than a cell is considered alive
- all organisms living today represent a continuous line of descent from those early cells.
- cells arise only by division of a previously existing cell.
4
Q
shared features of all cells
A
- obtain energy and nutrients from the environment
- use common building blocks to build things the molecules of life.
- use dna as a hereditary blueprint
- use rna to copy Dna