Microbiology Exam 2

Which of the following statements about archaea is FALSE?

• They are prokaryotes.

• They lack peptidoglycan in their cell walls.

• Some are thermoacidophiles; others are extreme halophiles.

• They evolved before bacteria.

• Some produce methane from carbon dioxide and hydrogen.

Which of the following characterizes the Domain Bacteria?

• prokaryotic cells; ether linkages in phospholipids

• eukaryotic cells; ester linkages in phospholipids

• prokaryotic cells; ester linkages in phospholipids

• complex cellular structuresE) multicellular

If two organisms have similar rRNA sequences, you can conclude that they

• live in the same place.

• evolved from a common ancestor.

• will have different G-C ratios.

• will both ferment lactose.

• mated with each other.

Tags

NGSS.HS-LS4-1

All of the following statements are reasons why fluorescent in situ hybridization (FISH) has become a valuable tool for environmental microbiologists EXCEPT

• it allows for detection of uncultured microbes.

• it demonstrates the diversity of microbes in an environment.

• it allows observation of microbes in their natural environment in association with other microbes.

• it allows one to obtain pure cultures of microbes.

Which of the following criteria is most useful in determining whether two organisms are related?

• Both ferment lactose.

• Both are gram-positive.

• Both are motile.

• Both are aerobic.

• Each answer is equally important.

Clone

• genetically identical cells derived from a single cell.

• a genetically engineered cell.

• a taxon composed of species.

• a mound of cells on an agar medium.

• None of the answers is correct.

Into which group would you place a photosynthetic organism that lacks a nucleus and has a thin peptidoglycan wall surrounded by an outer membrane?

• Animalia

• Fungi

• Plantae

• Firmicutes (gram-positive bacteria)

• Proteobacteria (gram-negative bacteria)

Tags

NGSS.HS-LS1-5

Facultatively anaerobic gram-negative rods are found in

• Dogs

• Humans

• Plants

• Cats

Requirements for X and V factors are used to identify

• Staphylococcus.

• Escherichia.

• Neisseria.

• Haemophilus.

• Pseudomonas.

Identify each of the following as either gram-negative or gram-positive.

A) Bacillus:

B) Escherichia:

C) Lactobacillus:

D) Staphylococcus:

E) Streptococcus:

1) Gram-positive

2) Gram-negative