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Example Questions
Example Question #1 :Classes Of Bacteria
If a colony of round or oval-shaped bacteria are arranged in a random grape-like cluster, they must be:
There is no way to predict based on the information provided.
Streptobacilli
Streptococci
Staphylococci
Spirochetes
Staphylococci
The two most common bacterial arrangements areStaph-andStrep-.Staph- is a non-symmetrical arrangement like a cluster of grapes.Strep- indicates a chain of bacteria.
The three most common bacterial shapes are listed below.
Coccus—round or oval
Bacillus—rectangular or rod-shaped
Spirilla(spirochete)—spiral
By breaking down names into arrangement and shape, students can predict or identify the appearance of an organism by its name. In the example Staph indicates arrangement in a chain. Coccus indicates round or oval in shape. Therefore, Staphylococci are round or oval-shaped organisms arranged in a cluster.
Example Question #1 :Classes Of Bacteria
Which of the following correctly describes the classification ofBordetella pertussis?
Gram negative aerobic rod
Gram negative anaerobic cocci
Gram positive anaerobic rod
Gram positive aerobic cocci
Gram negative aerobic rod
Bordetella pertussisis a Gram negative, rod-shaped aerobe. It requires oxygen to function and commonly infects the respiratory tract of young children, causing whooping cough.
Example Question #14 :Bacteria
Which of the following describes the classification ofNeisseria gonorrhoeae?
Gram positive diplococcus
Gram positive rod
Gram negative rod
Gram negative diplococcus
Gram negative diplococcus
Neisseria gonorrhoeaeis a Gram negative coccus bacterium that generally presents as a diplococcus (in pairs of cocci).
Example Question #11 :Microbiology
Vibrio choleraeis classified as what type of bacteria?
Gram negative cocci
Gram positive cocci
Gram negative facultative rods
Gram positive facultative rods
Gram negative facultative rods
Vibrio choleraeis classified as Gram negative facultative rods. This bacteria is the most well known amongst theVibriospecies as it's the cause of cholera, which produces a toxin that causes very severe diarrhea.
Example Question #12 :Microbiology
Any species of bacteria that feeds on dead matter is termed a__________.
Thermophile
Halophile
Saprophyte
Archaebacteria
Saprophyte
Bacteria or any other microbes that feed on dead matter are termed saprophytes. Thermophilic microbes thrive in heated environments, halophiles such asVibrio parahaemolyticus prefer salt water, and archaebacteria are a group of bacteria found in high heat, high salt content locations such as sewage treatment plants and are able to tolerate many extreme habitats.
Example Question #1 :Classes Of Bacteria
E. coliis classified as what type of bacteria?
Gram positive rod
Gram positive cocci
Gram negative cocci
Gram negative rod
Gram negative rod
E. coliis a Gram negative rod. It's a lactose fermenting bacteria commonly implicated in urinary tract infections and less frequently in gastroenteritis.
Example Question #11 :Microbiology
Which of the following describes the morphology and features of葡萄球菌species?
Gram negative rods, catalase negative
Gram positive rods, catalase negative
Gram positive cocci, catalase positive
Gram negative cocci, catalase positive
Gram positive cocci, catalase positive
葡萄球菌species are Gram positive, catalase positive cocci. The most famous member of this bacterial species, Staphylococcus aureus, is commonly implicated in skin infections, upper respiratory infections, and gastroenteritis (food poisoning).
Example Question #1 :Classes Of Bacteria
Which of the following bacteria is classified as Gram positive cocci?
Chlamydia trachomatis
Staphyloccocus aureus
Staphyloccocus aureus
Staphyloccocus aureusare Gram positive cocci.Chlamydia trachomatisandRikettsia prowazekiiare both classified as Gram negative rods andNeisseria meningitidisare Gram negative cocci.
Example Question #1 :Classes Of Bacteria
All of the following are Gram positive bacteria except__________.
Streptococcus
Staphyloccocus
Clostridium
Salmonella
Salmonella
All of the bacteria listed are Gram positive exceptSalmonella,which is a Gram negative facultative rod.
Example Question #21 :Bacteria
A sputum culture from a patient is described as "Gram positive cocci". What is the significance of the Gram stain?
细菌有厚厚的细胞壁肽聚糖
The bacteria has no chitin cell wall
The bacteria has no peptidoglycan cell wall
The bacteria has a thick chitin cell wall
The bacteria is actively multiplying
细菌有厚厚的细胞壁肽聚糖
革兰氏染色剂是一种测试用来帮助bac进行分类teria based on the presence of peptidoglycan in the cell wall. Bacteria with a thick peptidoglycan cell wall will stain dark purple, and are termed Gram positive. On the other hand, if there is no peptidoglycan cell wall (or a very thin one), it will show up as pink. This is termed Gram negative. This distinction is particularly important when prescribing classes of antibiotics, as the cell wall is commonly targeted by antibiotics.
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