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Beaver Local 14
| Question | Answer |
|---|---|
| all living things come from other living things | Biogenesis |
| Before the 17th century, people believed in _______________ _________________ | spontaneous generation |
| Redi conducted an experiment to show that maggots on rotting meat came from flies, ______ from spontaneous generation | NOT |
| Who conducted an experiment to show that maggots on rotting meat came from flies, NOT from spontaneous generation? | Redi |
| Hypothesized that microorganisms didn’t come from the air, but from other microorganisms | Spallanzani |
| Spallanzani’s Meat Broth Experiment Concluded that the open flask was contaminated from microorganisms in the ________. | Air |
| Used a curve-necked flask filled with boiled meat broth and let it sit for 1 year without it becoming contaminated with microorganisms | Louis Pasteur |
| Once the curved neck was broken off, the broth became contaminated | Pasteur’s Curve-neck Flask Experiment |
| About 5 billion years ago, our _______ ________was a swirling mass of gas and dust | Solar system |
| Over time, most of the gas and dust collapsed inward forming the _____ | Sun |
| Over time, most of this material collapsed inward forming the _____ | planet |
| Earth began to form _____ _______ years ago and grew by colliding with space debris | 4.6 Billion |
| atoms of the same element that have different numbers of neutrons | Isotopes |
| Some isotopes have unstable nuclei that undergo __________ _____________ | radioactive decay |
| the amount of time it takes for ½ of a sample of an isotope to decay | Half-life |
| The age of a material can be determined by measuring the amount of a particular __________ ____________ it contains | radioactive isotope |
| All living things contain ________ | Carbon |
| When an organism dies, the decay of _______ continues | C-14 |
| The half-life of C-14 is _________ years | 5730 |
| All of the elements found in _________ _________ are thought to have existed on Earth and in the solar system when Earth formed | organic compounds |
| Who suggested that the atmosphere of early Earth was very different (mainly NH4, H2, water vapor, and compounds made of hydrogen and carbon, such as methane) | Alexander Oparin |
| At temperatures above the _______ _______ of water, these gases might form simple organic compounds | boiling point |
| When Earth cooled and water vapor condensed, these simple organic compounds collected in the _____ and _______ | lakes, seas |
| When exposed to lightening and ultraviolet radiation, chemical reactions could have created | macromolecules |
| Designed a chamber filled with gases that Oparin assumed were present in Earth’s early atmosphere | Miller-Urey Experiment |
| When the gases were exposed to a spark, organic compounds, including _________ _______ formed | amino acid |
| __________contain many different organic compounds | Meteorites |
| Some of Earth’s organic compounds may have been carried to our planet by _______ _______ | space debris |
| ________ _________and many other scientists have been able to create cell-like structures in the lab | Sidney Fox |
| spherical shape; composed of protein molecules arranged as a membrane | Microspheres |
| Collections of droplets that are composed of molecules of different types, including __________ _________ and_______ | amino acids, sugars |
| Although coacervates can get bigger and microspheres can break off into smaller pieces, they both lack genes and therefore are ____ affected by natural selection | NOT |
| It has been found that some RNA molecules behave like proteins and catalyze ________ _________ | Chemical reactions |
| Who found that RNA in some unicellular eukaryotes acts as an enzyme (ribozyme) | Thomas Cech |
| Who discovered life may have started with self-replicating molecules of RNA | Cech |
| Characteristics of the first cells 1)______ 2)_____ 3)_______ | 1)anaerobic 2)prokaryotic 3)heterotrophic |
| Energy is obtained from the oxidation of inorganic molecules such as sulfur. Name an example. | archaebacteria |
| _______ is a byproduct of photosynthesis and would have been harmful to some early unicellular organisms | Oxygen |
| It would take at least a _______ years to develop the amount of O2 that we have now | billion |
| As photosynthetic organisms increased, the oxygen levels _____ | rose |
| Eventually, the ozone layer formed in the __________ ___________ that protected life-forms from damaging UV radiation | upper atmosphere |
| Who is responsible for the Endosymbiont Theory | Lynn Margulis |
| a small prokaryote (mitochondria or chloroplast) became engulfed by a larger cell and developed a symbiotic relationship | Endosymbiosis |
Created by:
kjones0722
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