differential media

Question 1

is staphylococcus gram positive or negative

Answer 1

gram positive

Question 2

can staphylococcus form endospores?

Answer 2

no

Question 3

are staphylococcus motile

Answer 3

no

Question 4

what does chemoorganotrophic mean?

Answer 4

they get carbon and energy form organic compounds

Question 5

where is staph epi found on the body?

Answer 5

on the skin

Question 6

why is staph aureus bad?

Answer 6

it contains enzymes that allow it to infect healthy tissue and cause disease

Question 7

what color do staphs turn manitol salt agar?

Answer 7

yellow

Question 8

can staph aureus produce coagulase?

Answer 8

yes

Question 9

what does bubbling mean in the catalase test?

Answer 9

catalase positive

Question 10

can staph epi coagulate?

Answer 10

no

Question 11

can strep grow on manitol salt agar?

Answer 11

no

Question 12

what is the formula to calculate original cell density?

Answer 12

colonies counted divided by the loop volume

Question 13

what is manitol salt agar used for?

Answer 13

to determine staph

Question 14

what color does staph aureus turn mannitol salt agar?

Answer 14

yellow

Question 15

what color does staph epi turn mannitol salt agar?

Answer 15

pinkish red

Question 16

what is xylose lysine desoxycholate agar used for?

Answer 16

to inhibit the growth of gram positive cells

Question 17

what does poor growth in xylose lysine determine?

Answer 17

gram positive cell

Question 18

what does good growth in xylose lysine determine?

Answer 18

gram negative cell

Question 19

what does yellow growth in xylose lysine determine?

Answer 19

not shigella or providencia

Question 20

what does red growth with a black center indicate in xylose lysine agar?

Answer 20

probable salmmonella

Question 21

what does red growth without a black center indicate in xylose lysine agar?

Answer 21

probaable shigella or providencia

Question 22

how many milliliters did the volumetric loop hold?

Answer 22

0.001

Question 23

does columbia cna allow gram positive or gram negative organisms?

Answer 23

gram positive

Question 24

does eosin methylene blue agar support e coli?

Answer 24

yes

Question 25

do dyes inhibit the growth of gram positive or gram negative cells?

Answer 25

gram positive

Question 26

is streptococcus catalase negative?

Answer 26

yes

Question 27

what does homofermentative mean?

Answer 27

it only yields one end product

Question 28

what does hemolysis mean?

Answer 28

the breakdown of red blood cells

Question 29

what is alpha hemolysis?

Answer 29

a partial breakdown of the red blood cell

Question 30

what is beta hemolysis?

Answer 30

a complete breakdown of the red blood cell

Question 31

what is gamma hemolysis?

Answer 31

no breakdown of the red blood cell

Question 32

what did rebecca lance field do?

Answer 32

identified 5 distinct antigenic groups from a to e

Question 33

what is opotochin?

Answer 33

an antimicrobial that most alpha hemolytic step are resistant to

Question 34

what is bacitracin?

Answer 34

works well on group a beta hemolytic strep

Question 35

what is sxt?

Answer 35

works on beta hemolytic members of group c

Question 36

what is the camp reaction?

Answer 36

a reaction where group b strep chances the beta hemolytic property of staph aureus