1.5 IB Bio Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Term | Definition |
When did life begin? | -Earth is 4.5 billion years old -It took approx .5 billion years for the Earth to cool to form a crust -As early as 4 billion years ago early cells existed |
Cell Theory questioned in the origin of cells | -All cells come from pre-existing cells |
The four/five steps in creating the first cells (Step One) | 1. The non-living synthesis of simple organic molecules from a mixture of any three of methane, hydrogen, ammonia and water vapor. |
The four/five steps in creating the first cells (Step Two) | 2. The assembly of these molecules into polymers |
The four/five steps in creating the first cells (Step Three) | 3. The origin of self-replicating molecules that make inheritance possible |
The four/five steps in creating the first cells (Step Four) | 4. The packaging of these molecules into membranes with an internal chemistry different from their surroundings. |
The four/five steps in creating the first cells (Step Five) | 5. The development of binary fission of these protocells. |
Symbiosis | An association between two or more species. |
Endosymbiosis theory (Eukaryotes are formed from prokaryotes) | -Mitochondria of eukaryotes came from aerobic bacteria -Chloroplasts evolved from primitive autotrophic prokaryotes -Both were taken into larger heterotrophic cells by endocytosis -Eukaryotes then formed membranes that could contain the prokayotes |
Evidence to Endosymbiosis Theory | -Mitochondria and chloroplasts have DNA that is separate from the cells nuclear DNA -This DNA is similar to prokaryotic DNA (not associated with proteins) -Mitochondria and chloroplasts have small 70S ribosomes (regular eukaryotic ribosomes are 80S) |
Evidence to Endosymbiosis Theory- Part 2 | -Mitochondria and chloroplasts have double membrane |
Prior to Louis Pasteur (1822-1895) | -Notion of spontaneous generation was commonly accepted -This proposed that life is continuously being spontaneously created where no life previously existed |
Louis Pasteur's Experiment Step One | -Started with two flasks and a nutrient broth in each |
Louis Pasteur's Experiment Step Two | -Bent the necks of the flasks into "S" shapes |
Louis Pasteur's Experiment Step Three | -Boiled the broth to kill any existing microbes |
Louis Pasteur's Experiment Step Four | -Broke off the swan neck from the 1st flask only, exposing the nutrient broth to air from above. -In flask 2, dust particles remained near the tip of the swan neck |
Louis Pasteur's Experiment Step Five | -The broth in the broken flask quickly became cloudy (a sign of microbial life) -The unbroken flask remained clear |
Created by:
averyschwarz
Popular Biology sets