Place the following steps of recognition of an antigen by...

Name: Problem 6, Chapter 45: Biology: The Dynamic Science
Uploaded: 2021-07-17T07:53:00-08:00
Duration: 1 min 58 s
Channel: Joanna Quigley
Description: Place the following steps of recognition of an antigen by lymphocytes in the order in which they would occur: 1. Bacteria degraded 2. Dendritic cell engulfs bacteria 3. T cells activated A. Antigens bind to class II MHC proteins 5. Plasma cells and memory cells produced a. 1,2,3,4,5 b. 3,2,1,4,5 c. 4,3,1,2,5 d. 2,1,4,3,5 e. 5.4,3.2 .1

Place the following steps of recognition of an antigen by lymphocytes in the order in which they would occur: 1. Bacteria degraded 2. Dendritic cell engulfs bacteria 3. T cells activated A. Antigens bind to class II MHC proteins 5. Plasma cells and memory cells produced a. 1,2,3,4,5 b. 3,2,1,4,5 c. 4,3,1,2,5 d. 2,1,4,3,5 e. 5.4,3.2 .1

Place the following steps of recognition of an antigen by lymphocytes in the order in which they would occur:
1. Bacteria degraded
2. Dendritic cell engulfs bacteria
3. T cells activated
A. Antigens bind to class II MHC proteins
5. Plasma cells and memory cells produced
a. 1,2,3,4,5
b. 3,2,1,4,5
c. 4,3,1,2,5
d. 2,1,4,3,5
e. 5.4,3.2 .1

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Key Concepts

Antigen Processing

This refers to the breakdown of pathogens into smaller peptide fragments within antigen-presenting cells. These peptides are essential for the immune system to display fragments of the pathogen to T cells, initiating an immune response.

Antigen Presentation

After processing, peptides are loaded onto major histocompatibility complex class II (MHC II) molecules. This complex is then transported to the cell surface, where it can be recognized by T cells, thereby linking innate and adaptive immunity.

Dendritic Cells

These are specialized antigen-presenting cells that play a crucial role in the immune response. They capture pathogens by engulfing them, process the antigens, and present them on MHC II molecules to T cells, thus bridging the innate and adaptive immune responses.

T Cell Activation

T cells, particularly helper T cells, recognize antigens presented on MHC II molecules. This recognition triggers their activation, leading to a cascade of events that enhance the immune response, including the activation of B cells.

B Cell Activation and Differentiation

Once T cells are activated, they help stimulate B cells to differentiate into plasma cells and memory cells. Plasma cells produce antibodies to target the pathogen, while memory cells provide long-term immunity.

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