Microorganism Practice Questions

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In a Gram-negative bacterium, where would you expect to find porins?

In the cell membrane

In the outer membrane (correct)

Both A and B

neither A nor B

where would you expect to find lipopolysaccharide (LPS)?

The cell membrane of a typical Gram-negative bacterium

The cell membrane of a typical Gram-positive bacterium

The cell membrane of a typical member of the domain Archaea

The outer membrane of a typical Gram-negative bacterium (correct)

Which of the following is the best description of pili (singular pilis)?

Extracellular protein rods (correct)

Gas-filled intracellular bodies

Intracellular protein scaffolds that support the cell membrane

Long polysaccharides that extend from the outer membrane

Which of the following could be used as a terminal electron acceptor by a bacterial cell that obtains energy by oxidizing nitrite (NO2-) to nitrate (NO3-)?

Oxygen (O2) Signup and view all the answers

Which of the following would be an appropriate description of the cell described: A bacterial cell that obtains energy by oxidizing nitrite (NO2-) to nitrate (NO3-)

A lithotroph Signup and view all the answers

This question is about endospores. Which of the following is NOT correct?

Endospores are produced by most members of Actinobacteria Signup and view all the answers

Which of the following traits is NOT seen in 'enteric bacteria' (Enterobacteria, ex: Escherichia coli)?

Teichoic acids Signup and view all the answers

Which of the following is NOT correct?

Bacteriochlorophylls are present in green sulfur bacteria (Chlorobi) but not in purple bacteria Signup and view all the answers

Which of the following features would you expect to find in a member of Domain Archaea?

A single circular chromosome Signup and view all the answers

In Eukaryotic algae that obtained their plastids by secondary endosymbiosis, what was the evolutionary origin of the innermost of the membranes surrounding the plastid?

The cell membrane of the cyanobacterial endosymbiont Signup and view all the answers

The diagram (think of the box) shows a transverse section of the frustule of a diatom (Bacillariophyta). Which of the following correctly labels the components 'A', 'B' and 'C'

A = Valve, B = Girdle band, C = Epitheca Signup and view all the answers

This question is about the life cycle of Apicomplexa (members of the genus Plasmodium, the causative agent of malaria). Which of the following is the life-cycle stage produced via meiosis?

Sporozoites Signup and view all the answers

Which of the following occurs during 'conjugation' in typical ciliates?

Haploid nuclei are exchanged between two cells Signup and view all the answers

Which of the following groups of Fungi would normally have septate hyphae?

Both A and B Signup and view all the answers

this is a question about the life cycle of (most) red algae. Which of the following is diploid?

The carpospores Signup and view all the answers

Which of the following best describes the thallus of Macrocytis sporophytes?

Develops through parenchymatous growth with some medullary cells in the form of 'trumpet hyphae' Signup and view all the answers

which of the following represents a monophyletic group of organisms?

None of the above Signup and view all the answers

which of the following is the best description of the makeup of peptidoglycan?

Polysaccharides linked by short chains of amino acids Signup and view all the answers

Where do you find lipopolysaccharides (LPS)?

Outer membrane of Gram-negative bacteria Signup and view all the answers

Which of the following best describes the bacterial flagellum?

A rotating filament powered by the proton motive force (PMF) Signup and view all the answers

This question is about typical endospores. Which of the following is correct?

The cortex wall of the endospore contains modified peptidoglycan Signup and view all the answers

Which of the following produces oxygen (o2) as a waste product during photosynthesis?

Cyanobacteria Signup and view all the answers

Which of the following is most correct? 'The standard cell membrane lipids of Archaea..."

... have hydrophobic tails attached to the glycerol backbone via 'ether' bonds (C-O-C) Signup and view all the answers

Which of the following is most correct?

Methanogens are obligate anaerobes Signup and view all the answers

Which of the following is the most typical number of membranes surrounding the plastid of a 'secondary alga'?

4 Signup and view all the answers

In 'secondary endosymbiosis', what was the endosymbiont?

A primary alga Signup and view all the answers

This question is about the diatom frustule. When are 'valves' made?

Each cell makes one valve only shortly after cell division Signup and view all the answers

Which of the following occurs before/during binary fission (asexual reproduction) in typical ciliates?

Micronuclei undergo mitosis, while macronuclei divide through a non-mitotic process Signup and view all the answers

From the following options, which best describes when the endospore's cortex is synthesized (ex: in Bacillus)?

While the forespore is within the mother cell Signup and view all the answers

which of the following is most correct? The standard cell membrane lipids of Archaea...

... are much more similar to those of eukaryotes than those of bacteria Signup and view all the answers

This question is about bacterial flagella. Which of the following is NOT correct?

The flagellum is powered by ATP hydrolysis Signup and view all the answers

Which of the following forms a ring around the middle of a bacterial cell?

FtsZ Signup and view all the answers

From the following choices, what would you call a cell that oxidizes sulfur (S) to obtain energy and converts CO2 into new organic molecules for building new biomass?

Chemoautotroph Signup and view all the answers