Quiz 13

Which of the following statements is not true of protists? Moisture is absolutely essential to their existence. Most are free living. They make up a substantial fraction of the marine plankton. They are not known to cause diseases of humans

They are not known to cause diseases of humans

Archaeons have been isolated from temperate and cold environments

True

Diatoms have a distinctive two-piece wall of silica called a frustule.

True

Some archaeons are symbionts in animal digestive tracts.

True

Some methanogenic Archaea are capable of fixing nitrogen

True

Some photosynthetic bacteria produce gas vacuoles that regulate their buoyancy

True

Some species of cyanobacteria can fix atmospheric nitrogen

True

The Chloroplastida (green algae) include a wide diversity of forms ranging from unicellular to colonial individuals

True

The ability of the deinococci to resist radiation is due in part to an unusual ability to repair chromosome damage, even fragmentation

True

The primary ecological function of fungi is that of: producer. consumer. pathogen. decomposer

Decomposer

Archaeons are not known to incorporate (fix) carbon dioxide

False

Elementary bodies of chlamydiae are specialized for reproduction rather than infection

False

Yeast are true eukaryotes with a nucleus, mitochondria, and other membrane bound organelles including flagella.

False

Some anaerobic protists obtain energy using: mitochondria. cytochromes. hydrogenosomes. all of the choices

Hydrogensomes

Flexible bacteria with a helical shape are called: vibrios. spirilla. spirochetes. coccobacilli.

spirochetes.

All protists: are capable of cellular locomotion. can reproduce asexually. possess cilia or flagella. are free-living organisms.

Can reproduce asexually

Which of the following is not true about yeast? contains two or more nuclei reproduces either asexually by budding or sexually through spore formation are larger than most bacteria possesses eukaryotic organelles

contains two or more nuclei

Which of the following type(s) of vacuoles is(are) found in protists: contractile food alveolar contractile and food vacuoles

contractile and food vacuoles

A protist with two flagella where one is wrapped around a transverse groove and the other is drapped in a longitudinal grove would be a member of which group? ciliophora dinoflagellate trypanosome oomycetes

dinoflagellate

An organism that requires at least 1.5 M NaCl in order to grow is referred to as a(n): facultative halophile. extreme halophile. sodiophile. barophile

extreme halophile.

Which of the following is rare among protists? motility multicellularity eukaryotic none of these characteristics are rare among protists

multicellularity

The tangled mass or tissue-like aggregation in a mold is called a: hyphae. hypha. mycelium. thallus

mycelium

A group of bacteria that lack a murein-containing cell wall: rickettsias mycoplasmas endospore formers actinomycetes none of the above

mycoplasmas

This group of bacteria are ubiquitous in anaerobic environments including the lower GI tract and are prominent in marine sediments. nitrifying bacteria sulfate-reducing bacteria purple sulfur bacteria purple nonsulfur bacteria none of the above

sulfate-reducing bacteria