Exam_Review_2

Exam_Review_2 - DivyaBhamidipati [email protected] GraceLee ,sonoworries!,itjust .Ifyouhavequestions please please

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Divya Bhamidipati [email protected]   Grace Lee BISC 120 Midterm 2 Exam Review You guys are going to rock this test, so no worries! Remember that this review isn’t all inclusive, it just  hits some of the major points of what we’ve covered for this midterm. If you have questions,  please  please please  email us at  [email protected] !!!    Chapter 25:      History      of Life on Earth     Very simple cells could have been produced as the earliest forms of life through a sequence  of four main stages:  o 1) The _________ synthesis of small organic molecules such as __________ _______  and nitrogenous bases o 2) The joining of these small molecules into ___________________ such as proteins  and nucleic acids (self forming) o 3) The packaging of these molecules into ______________, droplets with membranes  that maintained an ____________ _________________. o 4) The origin of ________ _____________ molecules that eventually made inheritance  possible   What are some various hypotheses of where the synthesis of small organic molecules could  have occurred? What is the RNA world hypothesis?   Why is the fossil record said to be biased? Archaean Eon _____ billion years ago Earth forms 2.7 billion years ago ______________ Accumulation of oxygen  in the atmosphere;  enormous impact  many prokaryotes died,  some adapted via  cellular respiration
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Divya Bhamidipati [email protected]   Grace Lee Proterozoic Eon _____ billion years ago 1.2 billion years ago First Eukaryotes  First ____________  Eukaryotes _______________  Theory: mitochondria  and plastids were  formerly small  prokaryotes that began  living within larger cells REVIEW:   serial  endosymbiosis Phanerozoic Eon 535 – 525 million years  ago _________ _____________ Modern animal phyla  appear suddenly in fossil  record; large predators  appear _____ million years ago Colonization of Land  Begins Vascular tissue appears  at 420 million years;  plants colonized land in  the presence of fungi _________ are first  animals to colonize land 251 million years ago _____________ ________________ Claimed about 96% of  all __________ animal  species; drastically  altered life in the ocean ;  occurred in less than  500,000 years Caused by drastic  climate change from  volcanic eruptions,  __________ of earth’s  climate, and reduction in  the ___________ of  ocean water leading to  drop in oxygen  concentrations; possible  destruction of the  ________ ________
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Divya Bhamidipati [email protected]   Grace Lee ~65.5 million years ago ________________ ___________________ Extinguished more than  half of all marine species  and eliminated many 
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Exam_Review_2 - DivyaBhamidipati [email protected] GraceLee ,sonoworries!,itjust .Ifyouhavequestions please please

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