Which of the following steps has not yet been accomplished by scientists studying the origin of life? a) synthesis of small rna polymers by ribozymesb) abiotic synthesis of polypeptidesc) formation of molecular aggregates with selectively permeable membranesd) formation of protocells that use dna to direct the polymerization of amino acidse) abiotic synthesis of organic molecules

Which of the following matches the organisms described with the correct domain? a. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycanb. archaea--multicellular, eukaryotic organisms that do not have cell wallsc. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sourcesd. bacteria--unicellular, eukaryotic organisms that always lack cell walls

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is most likely effect on the ecosystem?