#Question id: 40487
#Applied Microbiology
Match the Chemical/Term (List I) with its description or impact (List II).
| List I (Term) | List II (Description) |
| A. CFCs | 1. Replacement for CFCs; zero ODP but high GWP. |
| B. HFCs | 2. Used in fire extinguishers; contains Bromine which depletes ozone. |
| C. Halons | 3. Major ODS used in refrigerants; releases Chlorine. |
| D. UV-B | 4. Radiation absorbed by the ozone layer; causes skin cancer. |
#Question id: 40488
#Applied Microbiology
The water activity (aw) of pure water is equal to:
#Question id: 40489
#Applied Microbiology
Which class of microorganisms is specifically adapted to grow in environments with very low water activity (high salt concentration)?
#Question id: 40490
#Applied Microbiology
Read the following statements regarding water availability:
Statement I: Water activity (aw) is defined as the ratio of the vapor pressure of the solution to the vapor pressure of pure water.
Statem
#Question id: 40491
#Applied Microbiology
Assertion (A): Foods like jams and jellies rarely undergo bacterial spoilage even at room temperature.
Reason (R): High concentrations of sugar reduce the water activity (aw), creating hypertonic conditions that dehydrate bacteria (plasmolysis).
#Question id: 40492
#Applied Microbiology
Which molecule on the surface of a Helper T lymphocyte (Th) is responsible for recognizing antigens presented by MHC-II?