Midterm 1 HU Flashcards
1
Q
Enterococcus true?
A
Aerotolerant anaerob?
2
Q
There are 5 samples. 1 of them is salmonella +, What to od?
A
Bann it.
3
Q
L. monocytogenes, which is true?
A
Remnose +, xylose -, CAMP test + w/ staph aureus.
4
Q
On which pH is the sorbine acid the most effective?
A
4.
5
Q
What’s true for Staph aureus?
A
It has thermo- stabile desoxi ribonuclease.
6
Q
What is the meaning of TDT?
A
Thermal death time.
7
Q
Botulinum toxin.
A
causes diarrhea.
8
Q
Which is psycrophile?
A
- Staph aur.
- Yersinia enterocolitica.
9
Q
Where does the toxin of Cl perfringens generate?
A
- In the intestine system.
10
Q
What is the letter z stands for?
A
The temp increase necessary for the reduction of decimal reduction time (D) by 1magnitude.
11
Q
There are 44 colonies on the agar. The dilution is 10^-4. What’s the number of the microbes? ( basic value/ dilution)
A
- Key number = last dilution with +++ and the 2 numbers after that —> look for number in table
