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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

An antigen-presenting cell:

a. can be a CD8+ T cell.

b. derives from a phagocytic cell and exposes an antigen to alymphocyte.

c. secretes antibodies.

d. cannot be a B cell.

e. cannot stimulate helper T cells.

Summary Introduction

Introduction:

The antigen presenting cells (APC) or the accessory cells are the cells that exhibit the antigens, which are complexed with the major histocompatibility complex (MHC) proteins present on their surface and this phenomenon is called as antigen presentation.

Explanation

Justification for the correct answer:

Option (b) states that APC derives from a phagocytic cell and exposes an antigen to a lymphocyte. This is a true statement as specialized APC including B cells and macrophages present the antigens either to helper or cytotoxic T cells. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) states that APC can be a CD8+ (cluster of differentiation) T cell. This is false as the CD8+ T cell or the cytotoxic T cells have the CD8 protein present on the cell surface, which permits them to identify, attach, and eradicate the cells that are infected by pathogens...

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