Question

biosignature -32SH2- carbon-fixation- biomass- DNA polymerase -nitrogen-fixation -12CO2- RNA polymerase -32SH2 -vertical gene transfer- hopanoid -energy- horizontal gene transfer -13CO2- isotope ratio (use these words to fill in the blank each one can only be used once you will not need them all)

In order to identify when the first forms of bacterial life began on earth, scientists use ____________________s that reflect different forms of biological metabolism. For example, the depletion of ____________________ from ancient mineralized carbon rock represents the presence of ____________________ by bacteria for the purpose of ____________________ production. Another commonly used ____________________ is the presence of ____________________s that are specific to bacterial membranes. Scientists use taxonomic trees to graphically show the evolutionary relationship between bacterial species present on earth today. Ideally, these trees represent the number of genome changes that have accumulated over time due to ____________________ errors. For this reason, scientist use the sequences of highly conserved genes that are primarily inherited through ____________________.

Answer 1

order to identify when the first forms of bacterial life began on earth, scientists use biosignatures that reflect different forms of biological metabolism. For example, the depletion of 13CO2 from ancient mineralized carbon rock represents the presence of Carbon fixation by bacteria for the purpose of energy production. Another commonly used biosignature is the presence of hopanoids that are specific to bacterial membranes. Scientists use taxonomic trees to graphically show the evolutionary relationship between bacterial species present on earth today. Ideally, these trees represent the number of genome changes that have accumulated over time due to DNA polymerase rrors. For this reason, scientist use the sequences of highly conserved genes that are primarily inherited through vertical gene transfer