BIOL 1202 Lecture 4: chapt04_SSG
Document Summary
This chapter focuses on archaeal cell structure and function. The organisms in this domain occupy extreme habitats. They are also considered ancient organisms and thus, are an essential part of a microbiology curriculum. The immense diversity of this domain prohibits lengthy discussion at this level. Archaeal cell envelopes: cell envelopes include the plasma membrane and any layers outside the plasma membrane, cell wall. Some methanogens have an extra layer of material outside the s-layer. Prescott"s microbiology, 9th edition affect on archaeal cell walls. Has inclusions, ribosomes, nucleoid and in some cases plasmids: ribosomes are different in shape and different in nucleotide sequences. Different protein composition, archaeal ribosomes have more proteins: nucleoid contains the chromosome which is circular and double-stranded dna. Some archae have multiple copies of their chromosomes throughout their life cycles-polyploid: have a protein, alba that is used to compact the chromosomes in the phylum crenarchaeota.
