Quiz 8

which of the following is NOT true of a capsule found on s. aureus? options: capsule is one type of glycocalyx found in prokaryotes, capsule prevents host immune cells from destroying these bacteria, the capsule contains sugars, the capsule is made of peptidoglycan

capsule is made of peptidoglycan

what is the function of the coagulase enzyme made my staphylococcus aureus bacteria?

coagulase causes blood clots to form in the human host

a patient gets sick after they received an injection with a syringe that was not properly sterilized. this scenario is an example of:

indirect contact transmission (syringe is a FOMITE)

describe the characteristics of the bacteria staphylococcus epidermis

spherical (coccus) bacteria that perform binary fission long random planes of division

currently, what is the major concern of doctors trying to prevent and treat MRSA infections?

that certain strains of s. aureus will become resistant to all available antibiotics

the bacterium responsible for causing the plague (yersinia pestis) infects ground squirrels and gophers. The bacterium is occasionally transferred to humans who have direct contact with infected animals. based on this information, you conclude that:

the plague is an example of zoonosis

how does the expression of beta-lactamase gene give microbes resistance to penicillin?

this gene encodes an enzyme that breaks a bond with a penicillin molecule

imagine that cows graze in a field that contains a well, and the farmer's family becomes ill with a GI pathogen after drinking the well water. What type of pathogen transmission is this?

vehicle transmission

which of the following is an example of vector transmission? Select ALL options: becoming ill after putting a contaminated pen in your mouth, a disease acquired through sexual contact, a bit from a mosquito that carries west nile virus, eating lettuce contaminated with Salmonella bacteria, a squirrel gets the plague after a bite from an infected flea

a bite from a mosquito that carries west nile virus, a squirrel gets the plague after a bit from an infected flea

which of the following bacterial species produce hemolysis? options: only s. aureus, only s. pyogenes, both, neither

both s. aureus, and s. pyogenes

chlamydia is _______ in the United States. options: endemic, epidemic, pandemic, a sporadic disease

endemic

you have recently identified a new toxin produced by a bacterium. it is composed of protein, has high toxicity, and is heat affected. you also discover that it targets liver cells. based on these characteristics, how would you classify this toxin?

exotoxin

if you get sick from eating a rare burger contaminated with a pathogenic E. coli strain, which portal of entry did the microbe use?

mucous membrane

which of the following scenarios do you think would result in the highest incidence of disease? options: new virus spreads via droplet, and STI which spreads through sexual contact pathogen that spreads via contaminated water, microbe that spreads via tick bite

new virus spreads via droplet