Microbiology Questions

Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?A) Blue ColourB) Appearance of growthC) Both (a) and (b)D) None of these

The oxidase test is used to identify bacteria that produce:A) lipaseB) amylase and maltaseC) caseinase.D) gelatinaseE) none of these

A nosocomial infection isA) always present, but is inapparent at the time of hospitalization.B) acquired during the course of hospitalization.C) always caused by medical personnel.D) only a result of surgery.E) always caused by pathogenic bacteria.

All of the following are true regarding NK cells EXCEPTA) They are a type of lymphocyteB) They are found in tissues of the lymphatic systemC) They have the ability to kill infected body cells and some tumor cellsD) They destroy infected body cells by phagocytosisE) They release toxic substances that cause cell lysis or apoptosis

Streaks plate was performed from a broth culture. After incubation confluent growth in all sectors was observed. Which of the following errors could NOT explain this result?a) forgot to pick a colony from the plateb) forgot to flame the loop between sectorsC) picked additional culture from the plate after the first sectord) crossed over the previous streak too many times at the beginning of a new sector.

Indole Test is used to detect the ability of microorganisms to produce the enzymeA) OxidaseB) CatalaseC) Ornithine decarboxylaseD) Tryptophanase

Which of the following structures would not be associated with fungi?A) MitochondriaB) Cell wallsC) ChloroplastsD) Spores

Indole test helps to identify enteric bacteria based on the ability of the microbesa) to produce Gasb) to produce Alkaline productsc) To breakdown amino acid Tryptophand) to produce Neutral products

The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect itA) Indole testB) Methyl red testC) Citrate utilization testD) Voges-Proskauer test

An example of the condition similar to lysogeny in animal cells would beA) Slow viral infectionB) Latent viral infectionC) T-even bacteriophage infectionD) Infections resulting in cell deathE) None of the above

A commensal bacteriumA) does not receive any benefit from its host.B) is beneficial to its host.C) may also be an opportunistic pathogen.D) does not infect its host.E) is beneficial to, and does not infect, its host.

Which of the following regulations should be observed in order to avoid injury and infectiona) Wash hands with liquid detergent (antibacterial soap)b) Tie back long hairc) Wash hands with detergent, tie back long hair, speak quietly and avoid unnecessary movements around while in the laboratory

Psychrophiles area) heat-loving microbesb) moderate-temperature-loving microbesc) cold-loving microbes

Which of the following is true about the structure of Gram-negative cell wallA) It is composed of a thick layer of peptidoglycan.B) It lacks an outer membrane.C) Include outer membraneD) It has a single lipid bilayer with lipopolysaccharides.

In which of the following tests bacterial identification is done based on their ability to form neutral products, such as acetoneA) Methyl Red testB) Citrate testC) Indole testD) Carbohydrate fermentation testE) Voges-Proskauer Test

which of the following describes the effect of ionizing radiation on microbes?A) Changes the 3-dimensional structure of proteins to a sional formB) substantially decreases matic activity, slowing microbial reproductionC) Induces electrons to jump out of the molecules of the microbeD) None of the above

What may the negative result for glucose test on the API 20E strip indicate?A) The tested organism did not grow in this microtube familyB) The tested bacterium is not from the EnterobacteriaceaeC) The tested bacterium belongs to EnterobacteriaceaeD) Both a and b are correct

In the Triple Sugar-Iron Agar Test yellow butt and yellow slant indicatesA) Fermentation of glucose has occurred, does not ferment either lactose or sucroseB) No fermentation of glucose, lactose or sucroseC) Ferments lactose and/or sucrose and fermentation of glucose occurredD) Fermentation of glucose has occurred and H2S has been produced

Voges-Proskauer Test determines the ability of microorganism to degradate glucose by producingA) Alkaline productsB) Neutral end productsC) GasD) None of these

Helicobacter pylori can grow in the stomach because itA) hides in macrophagesB) makes a capsuleC) possesses an enzyme that neutralizes HCLD) makes HCLE) Invades epithelial cells