1.) Why are we more especially vigilant about diseases for the Development lab?
ID: 11939 • Letter: 1
Question
1.) Why are we more especially vigilant about diseases for the Development lab?[Please remember to wash your hands!]
Choose ALL correct answers.
-Previous labs may have left traces of salmonella uncleaned on any surface in the room.
-All birds carry SARS.
-Fertile chick eggs contain salmonella bacterial cultures which can make you sick.
-New razor blades are probably sterile.
2.) The main difference between the eggs we are using in lab and the ones in your kitchen at home is that the lab eggs are ________________.
Eggs are a rich source of nutrients for other organisms (from small egg-eating predators to humans to microorganisms) because the yolk is supplied with abundant resoures for the rapidly-growing __________.
-fertilized; embryo
-developed; embryo
-fertilized; eggshell
-salmonella; mother
Explanation / Answer
1.) Why are we more especially vigilant about diseases for the Development lab?
[Please remember to wash your hands!]
Choose ALL correct answers.
-Previous labs may have left traces of salmonella uncleaned on any surface in the room.
-All birds carry SARS.
-Fertile chick eggs contain salmonella bacterial cultures which can make you sick.
-New razor blades are probably sterile.
You are using "asepsis" to try and avoid contamination of your cultures or yourself by bacteria. However, previous labs might have had people who weren't very scrupulous about cleaning work surfaces, or bacteria might have simply been left over by accident (such as from improper duration of disinfectant applied to surface leaving some bacteria alive.)
Fertile eggs do contain salmonella, this is a natural part of the eggs miniature "ecosystem" but humans cannot consume it (it's why we prepare eggs in the first place.)
As for SARS, not all birds necessarily have SARS, but almost if not all eggs have salmonella, that's what you're protecting yourself from primarily.
There's no such thing as "probably sterile" in an aseptic environment, either something comes from a sterile package or it doesn't. If you have doubts about the sterility of equipment, dispose of it and get sterile equipment.
2.) The main difference between the eggs we are using in lab and the ones in your kitchen at home is that the lab eggs are ________________.
Eggs are a rich source of nutrients for other organisms (from small egg-eating predators to humans to microorganisms) because the yolk is supplied with abundant resoures for the rapidly-growing __________.
-fertilized; embryo
-developed; embryo
-fertilized; eggshell
-salmonella; mother
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