Quiz Over Chapter 17 Microbiology
11 Questions
| Total Attempts: 53
Microbiology is a branch of the scientific topic of biology wherein we take a closer look at some of the organisms that the naked eye itself can’t provide a lot of information on – those bacteria, fungi, viruses and more which need to be looked at and analysed with a microscope.
Questions and Answers
- 1.The ability of the body to specifically react to a microbial infection. It usually includes a memory component & is acquired during the life of the individual.
- 2.Glycoprotein that reacts with (binds to) antigen
- 3.Have at least two binding sites for antigens; valence= number of binding sites
- 4.Recognize antigens in association with MHCs on APCs
- 5.Based on functions & cell surface glycoproteins called CDs (clusters of differentiations)
- 6.Classified as CD4 which are adhesion molecules that bind to MHC class II molecules on APCs; after binding APC, CD4 cells differentiate into Th1 and Th2 cells; Th1 cells secrete cytokines that stimulate other immune cells and also enable macrophages to degrade microbes that have invaded them; Th2 cells associated with parasitic infections and allergic reactions
- 7.Classified as CD8 which are adhesions that bind MHC class I molecules; when activated by Th cell, Tc cells become cytotoxic T lymphocytes (CTLs) which can lyse target cells (target cells have endogenous antigen combined with MHC molecule) or induce apoptosis; CTLs release perforin, then granzymes are allowed to enter cell
- 8.Appear to suppress other T cells
- 9.Chemicals by which cells of immune system communicate with each other
- 10.1st encounter with pathogen (antigen); appearance of IgM, followed by IgG; antibody increase is slow
- 11.More rapid; IgM production same as in primary response, but there is a rapid rise in IgG due to memory cell activity; antibody peak in 2-7 deays
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