Chapter 18 Microbiology - bacterial diversity
Photoheterotrophs absorb light for energy but do not typically
fix carbon dioxide
the firmicutes _________ are the only known phototrophs that produce endospores
heliobacteriaaceae
Which of the following is NOT correct about the outer membrane of a Gram-negative proteobacterial cell wall?
in pathogens, lipopolysaccharide facilitates phagocytosis
Which of the following factors is NOT involved in initiation of spore formation in firmicutes?
light limitation
Some gram-negative bacteria branch more deeply from the proteobacteria than the five greek-lettered classes do from each other. which phyla listed below is deep branching gram-negative?
proteobacteria
which phylum contains the purple bacteria?
proteobacteria
the following bacterial genera belong to the enterobacteriaceae. in particular, the heavily flagellated _________ displays swarming behavior prior to forming __________
proteus; biofilms
Which is NOT a common feature in many spirochetes?
rigid cell walls
A bacterial phylum is a group of organisms that share a common ancestor that diverged early from another bacteria based on
small-subunit (16s) rRNA sequences
which of the following is NOT correct with respect to the species of Frankia
some species have been found to form spores
The type of telomere pictured below is found in
streptomyces
bacteriodetes are important components of what ecosystem?
the human gut
Which of the following is NOT correct about microorganisms in the phylum Thermotogae?
they are aerobic heterotrophs
Which of the following is NOT correct with respect to the mycoplasmas?
they have some of the largest bacterial genomes
Which of the following is NOT correct regarding rhizobia?
they provide the host with leghemoglobins, which help the plant hosts combat pathogens
Which genus within the spirochetes includes the causative agent of Lyme disease?
Borrelia
a trait that differentiates all firmicutes and actinobacteria is
GC content
bacteria are widely diverse in their cell structure, metabolism, and ecological adaptations, but share some common traits. Which of the following statements is NOT true?
Mycoplasmas contain abnormal peptidoglycan and thus are not susceptible to antibiotics.
An ancient ____________ is assumed to be in the same lineage as mitochondria.
Rickettsia
Cyanobacteria contain subcellular structures called carboxysomes that are rich in the enzyme ________ that fixes CO2
Rubisco
Which of the following is an extremophile?
bacillus alkalophilus
Pseudomonas aeruginosa may form _______ in the lungs of cystic fibrosis patients
biofilms
cyanobacteria are the only prokaryotes that use ________ to photolyze water to produce oxygen
both photosystems I and II
Methylobacterium species are methylotrophs, which means that they
can oxidize reduced single-carbon compounds
which of the following is NOT a common cyanobacteria morphology
endospore
Cyanobacteria participate in multilayered microbial mats with sulfur phototrophs. These other phototrophs absorb light if they lie below the cyanobacteria by
absorbing light at longer wavelengths than Cyanobacteria
