29 terms

chapter 26

STUDY
PLAY

Terms in this set (...)

stromatolites
layered rocks that form when certain prokaryotes bind thin films of sediment together
snowball earth
The hypothesis that glaciers covered the planet's land masses from pole to pole 750 to 570 million years ago.
spontaneous generation
the idea that living things come from nonliving things
biogenesis
theory of life from life
ribozymes
RNA catalysts
protobionts
Aggregates of abiotically produced molecules.
three-domain system
A system of taxonomic classification based on three basic groups: Bacteria, Archaea, and Eukarya.
the main explanation for the lack of a continuing abiotic origin of life on earth today is that
our oxidizing atmosphere is not conductive to the spontaneous formation of complex molecules
which statement does not support the hypothesis that RNA functioned as the first genetic material of early protobionts
in modern cells, RNA provides the template on which DNA nucleotides are assembled
fossolized mats called stromatolites
date from 3.5 billion years ago and contain fossils that resemble modern filamentous prokaryotes
the O2 revolution changed earths environment dramatically. which of the following adaptations took advantage of this change?
the evolution of cellular respiration, which used O2 to help harvest energy from fuel molecules
the oldest known fossil of multicellular eukaryotes
are filamentous algae that date from 1.2 yrs ago
competition among various protobionts may have led to evolutionary improvement only when
some kind of heredity mechanism developed
which of the following represents a probable order in the biological history of earth
metabolism before mitosis
one current debate raises the issue that, rather than beginning in shallow pools, life could have began
near deep sea vents
which of the following steps has not yet been accomplished by scientist studying the origin of life
formation of protobionts that use DNA to direst the polymerization of amino acids
current debate about the # and boundaries of the kingdoms of life center mainly on which groups of organisms
prokaryotes and single-celled eukaryotes
the primitive atmosphere of earth may have favored the synthesis of organic molecules because it
was reducing and had energy sources in the form of lightening and UV radiation
life on earth is thought to have begun
between 3.5 and 4 billion yrs ago
stromatolites are
fossilized mats that contain the oldest known fossils of prokaryotes
liposomes are
spontaneously forming droplets of organic molecules surrounded by a lipid membrane
which of the following is a proposed hypothesis for the origin of genetic information
short RNA strands were capable of self replication and evolved by the natural selection of molecules and were most stable and autocatalytic
evidence that protobionts may have formed spontanesouly comes from
the laboratory synthesis of liposomes
banded iron formations in marine sediments produce evidence of
the accumulation of O2 in the seas from the photosynthesis of cyanobacteria
simple animals such as jellies and worms first appear in the fossil record around 600 million years ago. this time period may correspond to
the thawing of snowball earth
the first fossil of eukaryotic cells
appears after prokaryotes had been evolving on earth for 1.5 billion years
in the five kingdom system of classification
the fungi include absorptive heterotrophs
in oder to place a newly identified species into one of the traditional five kingdoms, the first piece of information you would need to know is
the absence or presence of a nuclear membrane
what is the diversity of life organized into 3 domans
the domains bacteria and archaea reflect the early evolutionary divergence within the prokaryotes