mona

Most bacteria are chemoautotrophs. symbionts. photoautotrophs. microbial predators.

What is the main difference between protists and bacteria? Bacteria are always gram-negative, protists are gram-positive Bacteria have DNA, protists do not. Protists have a nucleus, bacteria do not Protists cannot cause infections, bacteria can Protists are unicellular, bacteria are multicellular.  

Rickettsias belong to which major group of bacteria? Archaea cyanobacteria spirochetes viruses Proteobacteria    

Atmospheric chemists think that Earth’s first atmosphere contained no oxygen atoms.   consisted of carbon in the form of carbon dioxide.   was very similar to today’s atmosphere.   consisted of carbon in the form of carbon monoxide

Prions are composed of DNA, RNA, and protein. protein. DNA and protein. DNA. RNA.

What term is used to indicate a characteristic that is shared and inherited from a common ancestor? analogous trait   homologous trait   cladistic trait   outgroups   derived trait  

Eukaryotic cells are thought to have evolved before prokaryotic cells. appeared about 2.1 billion years ago. first appeared with tough cell walls. first appeared as parts of multicellular organisms. developed when mitochondria grew much larger in size that they had been previously.  

The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured cyanobacteria. eukaryotic algae. chemoautotrophic bacteria. archaebacteria. aerobic bacteria.    

Which form of bacterial cells is rod shaped? cocci vibrios spirilla rhodius Bacilli

In bacteria, the cell wall is composed mainly of various polysaccharides. peptidoglycans. proteins. glycoproteins. lipids.