Ap bio guided reading chapter 2 and 26 Essay

1358 Words Sep 11th, 2013 6 Pages
AP Biology Chapter 2 and 26 Guided Reading Assignment 1. An Element is a substance that cannot be broken down to other substances by chemical reactions, while a compound is a substance consisting of two or more different elements combined in a fixed ratio. 2.
Electron cloud:
Area around the nucleus where electrons are likely to be found.

Electron: particle with a negative charge

Neutron: a subatomic particle with no charge

Electron shell: the energy level where electrons are likely to be found.

Proton: subatomic particles with a positive charge. Nucleus: protons and neutrons are located in the center of the atom

3. Atomic mass is an approximation of the
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The reactions are still occurring but with no effect on the amount of reactants or products. Guided Reading Chapter 26: 1. Protobionts: collections of abiotically produced molecules surrounded by a membrane-like structure.
Ribozymes: Am enzyme like RNA molecule that catalyzes reactions during RNA splicing.
Radiometric Dating: A method paleontologist’s use for determining the ages of rocks and fossils on a scale of absolute time based on the half –life of radioactive isotopes.
Half-life: The time required for 50% of the isotopes to decay
Magnetic reversal: A reversal of the polarity of Earth’s magnetic field.
Geologic Record: The division of earth’s history into time periods.
Stromatolites: rocklike structure composed of layers of prokaryotes and sediment.
Serial Endosymbiosis: A model of the origin of eukaryotes consisting of a sequence of endosoymbiotic events in which mitochondria and chloroplasts and perhaps other cellular structures were derived from small prokaryotes that had been engulfed by larger cells.
Pangaea: a supercontinent formed near the end of the Paleozoic era when plate movements brought all the land masses of earth together.
Three Domain System: a system of taxonomic classification based on three super kingdoms: Bacteria, Archaea, and Eukarya 2. The earth is 4.6 billion years old. 3. Miller and Urey first demonstrated how organic matter might have formed in Earth's primitive atmosphere. By re-creating

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