Exam (elaborations)
Biology 242 LAB Exam 2 With Correct Questions And Answers 2024
- Course
- Institution
Biology 242 LAB Exam 2 With Correct Questions And Answers 2024
[Show more]
Content preview
Biology 242 LAB Exam 2 With Correct Questions And Answers 20243 physical requirements for microbial growth - CORRECT ANSWERS-temp, pH, osmotic pressure
agar deep - CORRECT ANSWERS-motility and O2 requirement
agar plate - CORRECT ANSWERS-isolated colonies
agar slant - CORRECT ANSWERS-transport and sustaining of cultures
agar? and what temp does it melt? - CORRECT ANSWERS-a gel-like polysaccharide compound used for culturing microbes; extracted from certain red algae; 100C
Alcohols - CORRECT ANSWERS-(Ethanol, Isopropanol) denature proteins (requires water), dissolve lipids. Can enhance effectiveness of other agents, used to degerm skin.
Antisepsis - CORRECT ANSWERS-Removing pathogens from living tissue
Asepsis - CORRECT ANSWERS-ABSENCE of contamination
Autoclave - CORRECT ANSWERS-· used for sterilizing culture media instruments, dressings, intravenous equipment, etc.
· Uses steam heat
· Autoclaves are more effective than hot air for sterilization
autotrophs - CORRECT ANSWERS-make there OWN food
Bacteriostasis - CORRECT ANSWERS-inhibiting growth, not killing microbes
Biguanides - CORRECT ANSWERS-(Chlorhexidine) disrupt plasma membranes, combined with detergent or alcohol in surgical scrubs
binary fission - CORRECT ANSWERS-organism separates into two new organisms and
splits cytoplasm evenly
Biofilms - CORRECT ANSWERS-bacteria grouped together in communities that provide
great BENEFITS from that grouping.
Bisphenols - CORRECT ANSWERS-· : (hexachlorophene, triclosan) disrupt plasma membranes broth - CORRECT ANSWERS-liquid media used for growing cells
Budding method - CORRECT ANSWERS-new organism is from old organism and cytoplasm splits unevenly
carbon cycle - CORRECT ANSWERS-o Carbon moves between the atmosphere and the ocean through diffusion.
o Aquatic plants absorb carbon through photosynthesis.
o Terrestrial plants remove carbon from the atmosphere through photosynthesis.
o Fish and other marine life and animals obtain carbon through consumption (heterotrophs); energy and CO2 released through respiration.
o Carbon is returned to water and air through respiration.
o When organisms die, carbon is decomposed and transferred through the ocean floor by sedimentation.
catalase - CORRECT ANSWERS-An enzyme produced in all cells to decompose hydrogen peroxide, a by-product of cell respiration
chemically defined media - CORRECT ANSWERS-growth of chemoautotrophs and photoautotrophs; microbiological assays
Colony - CORRECT ANSWERS-a population of cells arising from a single cell or spore (or from a group of attached cells)
complex media - CORRECT ANSWERS-growth of most chemoheterotrophic organisms
(EX:nutrient broth/agar)
Culture - CORRECT ANSWERS-microbes growing in/on culture medium
culture medium/media - CORRECT ANSWERS-Sterile (nothing growing yet) nutrient food source for growth of microorganisms
danger zone for food - CORRECT ANSWERS-15° to 52° C, 60° to 130° F
DEATH CURVE: Bacterial populations die at a constant logarithmic rate. - CORRECT ANSWERS-One log decrease= 90% of population killed
Death phase - CORRECT ANSWERS-least susceptible to antibiotics
Desiccation - CORRECT ANSWERS-· absence of water (extreme drying), prevents metabolism
differential media - CORRECT ANSWERS-differentiation of colonies of desired microbes from others
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 Elitaa. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.09. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76669 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now