#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?
#Question id: 40493
#Applied Microbiology
Consider the following statements regarding T-cell activation:
Statement I: MHC-I molecules are found on almost all nucleated cells in the body.
Statement II: Cytotoxic T cells utilize their CD4 co-receptor to stabilize the binding to MHC-I.
#Question id: 40494
#Applied Microbiology
Assertion (A): Cytotoxic T lymphocytes (CTLs) are essential for eliminating virally infected cells.
Reason (R): CTLs recognize viral peptides displayed on MHC-I molecules, which are expressed by nearly all nucleated cells.
#Question id: 40495
#Applied Microbiology
Match the T-cell component/type in Column A with its corresponding partner in Column B:
| Column A (Cell/Receptor) | Column B (Interaction Partner) |
| 1. Cytotoxic T Cell (CD8+) | i. MHC-II |
| 2. Helper T Cell (CD4+) | ii. MHC-I |
| 3. B Cell | iii. CD3 Complex |
| 4. TCR Signaling | iv. Native Antigen |