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Chapter 25 Campbell Biology Flashcards

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13764714798What is the hypothesis about chemical and physical formation of first ever cells?1) abiotic synthesis of small organic molecules 2) those molecules formed macromolecules 3) macromolecules were packed into protocells 4) the origin of self-replicating molecules0
13764740567When did the planet form?4.6 billion years ago1
13764748381Describe the first atmospherelittle oxygen, a lot of water vapor, chemicals released from volcanos (O2, CO2, NH4, H)2
13764764858How did oceans and lakes form in the early history of earth?As earth cooled, the heavy amount of water vapor condensed to form oceans and lakes3
13764789829Hydrothermal ventsspots on the ocean floor where hot gases and minerals escape from earth's interior into the water4
13764794579Alkaline ventsdeep sea vents that release water that has a high pH (9-11) and is warm (40-90ºC) rather than hot5
13764808777How do vesicles exhibit properties of life?these fluid filled compartments form spontaneously and have selective semipermeable membranes6
13764823836Ribozymesenzyme-like RNA catalysts7
13764836167What is meant by "RNA World"?RNA most likely came before DNA RNA is less fragile than DNA and its bonds are stronger and can be replicated more accurately making it more fit for the harsh conditions of early earth8
13764864276Stratalayers of sedimentary rock9
13764864277Radiometric datingthe process of measuring the absolute age of geologic material by measuring the concentrations of radioactive isotopes and their decay products - expressed by half life10
13764876461Half-lifelength of time required for half of the radioactive atoms in a sample to decay is not affected bu temperature, pressure, or other environmental variables11
13764895572What does Carbon-14 in an organism's dead body slowly decay into?Nitrogen-1412
13764905434Stromatoliteslayered rocket that form when prokaryotes bind thin films of sediment together because prokaryotes came first13
13764923505Where did most of the atmospheric O2 come from? What did this result in?photosynthetic prokaryotes released O2 it dissolved in water to react with iron forming rust and sediments making rocks14
13764943484Oxygen revolutionintense increase in atmospheric O2 that killed many prokaryotes15
13764973280THE Geologic RecordThe division of Earth's history into time periods, grouped into three eons—Archaean, Proterozoic, and Phanerozoic—and further subdivided into eras, periods, and epochs.16
13765052740Endosymbiosisprokaryotic cell engulfed a small cell that would evolve into the mitochondrion (the cell engulfed is the endosymbiont) how eukaryotes became17
13765074567Serial endosymbiosis theory. What is evidence supporting it?theory that mitochondria and plastids originated this way inside what became single organisms of which are thought to have been archaens 1) inner membranes of both organelles are similar to plasma membranes of living bacteria 2) DNA structure and cell division are similar to bacteria 3) both organelles transcribe and translate their own DNA 4) ribosomes are more similar to bacterial than to eukaryotic ribosomes18
13765105970What were the first eukaryotes?Archaebacteria19
13765206356Describe Cambrian explosionsudden appearance of fossils resembling modern animal phyla (however, cnidaria, sponges, and mollusks existed before this) first evidence of predator vs. prey had long fuse20
13765248519When did plants and animals begin to adapt to move from ocean to land?about 500 million years ago21
13765257930What are the most widespread and diverse land animals?arthropods and tetrapods22
13765267328How long ago did the human lineage evolve?6-7 million years ago23
13765284616Over the last billion years, landmasses of earth have formed a super continent multiple times. When were those instances?1 billion, 600 million, and 250 million years ago (Pangaea)24
13765295350Plate tectonics theorythe continents are part of great plates of Earth's crust that essentially float on the hot, underlying portion of the mantle25
13765316096When is the next super continent supposed to form?250 million years from now26
13765331618What are the effect of Pangaea - the supercontinent that formed 250 million years ago?deepening of ocean basins reduction in shallow-water habitat colder and drier climate inland27
13765352032True or False: Continental drift prevents allopatric speciationFALSE: Continental drift promotes allopatric speciation and can justify the distribution os fossils and living groups28
13765380664In each of the FIVE mass extinctions, ___% or more of marine life have vanished50% or more29
13765414619What happened in the Permian extinction and what caused it?in less than 500,000 years, 96% of marine animal species died causes: 1) volcanos in Siberia 2) global warming and ocean acidification from volcano CO2 dissolving 3) anoxic (oxygen-lacking) conditions from bacteria releasing phosphorus and nutrients30
13765465185What happened in the Cretaceous extinction and what caused it?took over 50% of sea life, many terrestrial plants and animals, and all of dinosaurs (except birds) causes: 1) presence of iridium in sedimentary rock from that time suggests meteorite impact 2) dust clouds from impact blocked the sun 3) the Chicxulub crater off the coast of Mexico is evidence of mass meteorite collision31
13765520580About how long does it take for diversity to recover following a mass extinction?5-10 million years32
13765525839adaptive radiationAn evolutionary pattern in which many species evolve from a single ancestral species which follows mass extinction, evolution of novel characteristics, and the colonization of new regions33
13765575475Heterchronyan evolutionary change in the rate or timing of developmental events34
13765586525What are contrasting shapes of human and chimp skulls the results of?relative growth rate35
13765600439Are chimp and human skulls more similar at birth or older age?at birth36
13765606328PaedomorphosisThe retention in an adult organism of the juvenile features of its evolutionary ancestors the rate of reproductive development accelerates compared with somatic development37
13765683598What do homeotic genes determine?where wings and legs are on the body plan38
13765793420Hox geneshomeotic genes that provide positional information during animal embryonic development (head-to-tail axis)39
13765810212What do changes in the Ubx gene result in?turns off let development40
13765837225Are changes in the regulation of development genes or changes to the sequence of genes more harmful?changes to the sequence of genes are more harmful41
13765888655What have complex eyes evolved from?photosynthetic cells (like simple limpets)42
13765927630Exaptionsstructures that evolve in one context but become co-opted for another function they do NOT evolve in anticipation of future use43

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