Foundations of Biology Flashcards
1
Q
What is the 1st foundation of Biology? and Evidence
A
Evolution through natural selection
- homology - common ancestral features
- fossils - increasing complexity over time
- biogeography - unique flora and fauna in continents
2
Q
2nd foundation of biology and evidence.
A
organisms share main biochemical reactions.
- all organisms have DNA
- all have proteins to carry out instructions - they are homologous
3
Q
3rd foundation of biology and evidence
A
every cell comes from other cells - CELL THEORY
- all known living things are made up of cells
- all living cells arise from pre-exiting cells by division
- cells contain hereditary info DNA
4
Q
what are the three domains of life
A
Prokaryotes - bacteria and archaea
Eukaryotes - eukarya
5
Q
two step process of evolution
A
- variability
2. natural selection
6
Q
What are two functions of bacteria?
A
- produce oxygen
* involved in nitrogen recycling - grab nitrogen from the atmosphere and fix it into biomolecules
7
Q
difference between gram +ve and gram -ve
A
+ve has one cell wall surrounding the membrane
-ve has two cell walls surrounding membranes
