MicroBio Exam 1 - Chapter 4

Which of the following is a characteristic of pseudomurein? L-amino acids in its cross-links Lacks amino acids in its cross links D-amino acids in its cross links

L-amino acids in its cross-links

Archaeal pili differ from bacterial pili due to the presence of

a central lumen

An archaeon in a nutrient-poor environment is most likely to use __________________ for nutrient uptake

ABC transport

Select all the characteristics that apply to archaea Archaea have histones associated with their chromosome. Archaea have multiple copies of chromosomes throughout their life cycle. The archaeal ribosomes are sensitive to the same antibiotics that inhibit bacterial ribosomes. Archaea have a nucleus. Archaea contain ribosomal proteins not found in bacteria or eukaryotes. Archaea have inclusions such as glycogen granules and gas vacuoles. Archaea have the cytoskeletal proteins actin and tubulin.

Archaea have histones associated with their chromosomes Archaea have multiple copies of chromosomes throughout their life cycle Archaea contain ribosomal proteins not found in bacteria of eukaryotes Archaea have inclusions such as glycogen granules and gas vacuoles

Archaea with a plasma membrane composed of a tetraether monolayer would most likely be found ______

At a temperature of 90 C

Considering the diversity of membranes and their components in bacterial and archaeal cells, which of the following statements are correct about ALL prokaryotic membranes? Branched hydrocarbons in the lipid side chains are critical for dense packing in a membrane. The fluid mosaic model of membrane structure applies only to bacterial membranes. The cell membrane must be a lipid bilayer to be an effective barrier between the cell cytoplasm and its external environment. Cell membranes require a hydrophobic interior and two hydrophilic surfaces to be an effective barrier between the cell cytoplasm and its external environment. Membrane lipids are covalently bonded to glycerol. Membrane thickness is equivalent to a 40-carbon hydrocarbon chain either in the form of two C20 bilayers, or a single C40 monolayer.

Cell membranes require a hydrophobic interior and two hydrophilic surfaces to be an effective barrier between the cell cytoplasm and its external environment. Membrane lipids are covalently bonded to glycerol. Membrane thickness is equivalent to a 40-carbon hydrocarbon chain either in the form of two C20 bilayers, or a single C40 monolayer.

If you found a microbe with an S-layer as the major component of its cell wall, how would you identify this microbe?

More information is needed

Check all of the structures associated with archaeal cells Pili Nucleus Hami 80s ribosomes Flagella Cannulae

Pili Hami Flagella Cannulae

Considering the variations in ribosomes found in bacterial and archaeal cells, which of the following statements are correct about ribosomes in both domains? Ribosomes are composed of RNA and protein Antibiotics that target the ribosome are effective against bacteria and archaea The small ribosomal subunit has 16S and 5.8S RNA molecules Ribosomes are composed of two subunits, a large 50S subunit and a small 30S subunit Ribosomal proteins from bacteria and archaea are also found in eukaryotes

Ribosomes are composed of RNA and protein Ribosomes are composed of two subunits, a large 50S subunit and a small 30S subunit Ribosomal proteins from bacteria and archaea are also found in eukaryotes

T/F in archaea, flagellar rotation is driven by ATP hydrolysis

True

An external structure unique to archaea are the ______

cannulae

Some archaea have been observed to form tube-like structures with tiny grappling hooks at the ends. These tube-like structures are called ______

hami

Archaeal flagella are _____, as opposed to their bacterial counterparts which are ______

solid, hollow