unit 1.2 Flashcards
1
Q
element
A
A pure substance made of only one kind of atom. Same number of protons and electrons
2
Q
Orbital
A
Area where electron is found
3
Q
two or more elements
A
compound
4
Q
Isotope
A
Number of neutrons varies
Atoms of the same element that have different numbers of neutrons.
5
Q
Energy levels
A
Grouping of orbitals
6
Q
Cell theory
A
- Cells are the smallest living things-basic unit units of organization of organisms
- All organisms are composed of one or more cells.
- Cells arise only from pre-existing cells through cell division.
- Today’s existing cells are descendants of first cells formed early in evolutionary history.
7
Q
Autolysis
A
The process of self-destruction in older weaken cells
8
Q
Golgi apparatus
A
Consists of assembly a flat sack like cisternae; used as storage area in cell
9
Q
Granum
A
A stack of thylakoids in a chloroplast
10
Q
Centrosome
A
Area near nucleus made of two centroles
11
Q
Centrioles
A
two centrioles make up a chromosome; they produce spindle fibres during cell division
12
Q
prokaryotic
A
cells that do not have a nucleus like bacteria
