Exam 18: Other Bacteria

In which habitat are geosmin- producing organisms found?

Flavobacterium colonies are often_________ - pigmented, rarely cause disease in humans, and are primarily found in _________environments.

Which of the following spirochete genera does NOT include a known human pathogen?

Heliobacteria are oxygenic phototrophs.

Coupled catabolism of a mixture of amino acids is known as the_________ .

The structure of the cell wall of cyanobacteria is most similar to that of gram- positive Bacteria.

Explain how deinococci are able to repair damaged DNA.

The virulence of Mycobacterium tuberculosis has been correlated with what component?

The numerically predominant organism in the human large intestine is_______ .

You have isolated a gram- positive coccus from your inner nose. The organism appears in cell clusters when viewed microscopically, is catalase positive, and grows well on a rich medium containing 7.5% sodium chloride. This bacterium is likely a member of the genus

Over __________distinct antibiotics have been shown to be produced by streptomycetes and many more are suspected.

Species of the genus Cytophaga produce resting spherical structures called microcysts.

The most abundant photosynthetic organism on Earth is

Staphylococcus epidermidis is most commonly associated with pathological conditions, including boils, pimples, pneumonia, and arthritis.

How do mycoplasmas lacking cell walls exist as living cells in the environment? How do they accomplish containing all of the necessary cytoplasmic components?

Mollicutes lack cell walls and are therefore neither gram- negative nor gram- positive.

The manufacture of Swiss cheese requires an initial fermentation of lactose to lactic acid by__________organisms. Next, lactate is fermented to propionate by the__________ bacteria.

Explain why observations of extensive cell compartmentalization in planctomycetes were unexpected, and describe what these compartments contain.

Explain why gram- positive cocci are routinely isolated from the skin and mucous membranes of humans.

What selects for endospore- forming bacteria from a consortium of diverse soil microorganisms?