Exam (elaborations)
MBY 161 Theme 4 Exam With Verified Solutions
- Course
- Institution
MBY 161 Theme 4 Exam With Verified Solutions...
[Show more]
Content preview
MBY 161 Theme 4 Exam With Verified SolutionsPhysical factors that are needed for the bacterial growth - Answer 1. Temperature
2. pH
3. Osmotic pressure
Chemical factors required for bacterial growth - Answer 1. Carbon
2. Nitrogen
3. Phosphorus
4. Sulfur
5. Oxygen
6. Organic growth substances
Temperature - Answer 1. Psychrophiles = Cold-loving microbes.
2. Mesophiles = Moderate-temperature loving microbes.
3. Thermophiles = Heat-loving microbes.
4. Psychotrophs = Microbes found in low-temperature food spoilage, growing relatively
well in refrigerator temperatures.
5. Hyperthermophiles = Extreme thermophiles
pH- Most bacteria grow best in a range of pH close to neutrality. Acidophiles = bacteria,
that are remarkable in their tolerance of acidity.
Osmotic pressure- Plasmolysis = loss of water resulting in shrinkage of cell's cytoplasm.
Extreme Halophiles = organisms that are well adapted to high salt concentrations and
require it for growth
obligate halophiles. Faculative Halophiles = grow at salt concentrations up to 2%.
, Carbon - Forms the structural backbone of all living matter.
Nitrogen, sulfur and phosphorus - Required for protein synthesis, the synthesis of DNA
and RNA as well as ATP. Nitrogen required for nitrogen fixation.
Trace elements - Iron, copper, zinc, etc. essential co-factors of certain enzymes.
Oxygen bacterial growth -
Obligate aerobes - Organisms that require oxygen to live.
Facultative anaerobes-Organisms that developed the ability to exist in environments
devoid of oxygen.
Biofilms-A thin, slimy layer of covering bacteria that adheres to a surface. A hydrogel is
a complex polymer containing many times its dry weight in water.
Culture media-A nutrient preparation used for the cultivation of microorganisms in a
laboratory.
Inoculum - Answer Microbes that are introduced into a culture medium to initiate
growth.
Culture - Answer The microbes that grow and multiply in or on a culture medium.
Petridish - Answer Agar media contained
Slants - Answer Contents of test tube allowed to solidify at an angle so that large surface
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Easton. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81113 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now