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Protists+Pond Water

BIO Lab Exam #3

QuestionAnswer
List the order of life events on Earth Origin of prokaryotes, accumulation of O2 in Earth's atmosphere, origin of eukaryotes, origin of multicellular organisms, diversification of animals, colonization of land by plants and fungi, origin of humans
DNA replication relies on the enzyme DNA polymerase. Why does this suggest that the earliest genes were made from RNA? DNA polymerase is a protein, which must be transcribed from a gene. A DNA requires DNA polymerase to be replicated. RNA can act as both an information-storage molecule and an enzyme.
Contrast exotoxins with endotoxins Exotoxins are poisons secreted by pathogenic bacteria; endotoxins are components of the outer membrane of the pathogenic bacteria.
Some species of cyanobacteria form symbiotic relationships with other organisms. What benefits might a protist or fungus receive from a cyanobacteria symbiont? What benefit might a plant receive from a cyanobacterial symbiont? Food (products of photosynthesis_; usable form of nitrogen
The bacteria that cause tetanus can be killed only by prolonged heating at temperatures considerably above boiling. What does this suggest about tetanus bacteria? They can form endospores
How is the process used in sewage treatment similar to the decomposition of leaf litter in a forest? Prokaryotes in soil or water decompose the organic matter in leaves and other plant, returning the elements to the environment in inorganic form. Prokaryotes in a sewage treatment facility decompose the organic matter in a similar way.
What do all protists have in common? They are eukaryotes that are not plants, animals, or fungi
Which protist is NOT a human pathogen? Paramecium
Which algal group is most closely related to plants? Green algae
Created by: sillylilly
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