Micro Chapter 15 hw and quiz answers
The structure of an IgG antibody consists of:
2 heavy chains and 2 light chains
T lymphocytes have accessory protein receptors associated with the TCRs (T cell receptors). T helper cells have __________receptors associated with the TCRs, whereas Tcytotoxic cells have __________receptors associated with the TCRs.
CD4, CD8
Which class of antibodies is a very important defense found in many of the body's secretions and in breast milk?
IgA
The primary B cell receptor is _______________whereas the primary T cell receptor is ______________.
IgD or IgM, the TCR
The predominant class of antibodies produced during the secondary (anamnestic) response is ________.
IgG
Which class of immunoglobulins can cross the placenta?
IgG
Which class of antibodies is the first to increase the first time the body is exposed to a specific antigen?
IgM
Which class of immunoglobulins has the largest molecular weight and is the first class to increase after the host encounters an antigen for the first time?
IgM
Which of the following cell types is not involved in the T-cell dependent pathway of antibody production?
T cytotoxic cells
Which of the following cell types is not involved in the body's cell-mediated immune response?
T helper 2 cells
The cross-linkage of antigens by antibodies is known as:
agglutination
Which of the following can serve as antigen presenting cells (APCs)?
all of these (B cells,macrophages,dendritic cells)
The body's humoral immune response involves the production of _______________________.
antibodies
Any foreign molecule which can trigger a specific immune response in the body is called a(an) _________________.
antigen
Vaccination is responsible for _____________________immunity.
artificial active
Immunization programs are designed to stimulate:
artificial active immunity
A living microbe with reduced virulence that is used for immunizations is considered:
attenuated
In humans, the B cells mature in the _______________and the T cells mature in the ________________.
bone marrow, thymus
Which of these characteristics is not a major factor in adaptive or acquired immunity?
chemotaxis
Helper T cells receive antigen from ______________, and cytotoxic T cells receive antigen from _______________.
class II MHC, class I MHC
__________________________are soluble proteins produced and secreted by activated white blood cells which intensify an immune response.
cytokines
The main result of the body's cell-mediated immune response is ________________________.
destruction of an infected or abnormal host cell
Class I MHC molecules are human cell receptors found on antigen presenting cells, whereas Class-II MHC molecules are human cell receptors found on all nucleated cells of the body.
false
MHC (Major Histocompatibility Complex) receptors play a major role in the immune response. MHC-1 receptors are found only on the antigen presenting cells of the body, whereas, MHC-II receptors are found on all of the nucleated cells of the body.
false
T lymphocytes play the major role in the body's humoral immune response.
false
Antibodies are specific _____________________produced and secreted by activated white blood cells during an immune response.
glycoproteins
Antibodies are:
glycoproteins
A small, foreign molecule which lacks sufficient secondary and tertiary structure to be immunogenic is called a(an) ___________________.
hapten
CD4 cells are _______________cells, and CD8 cells are _________________cells.
helper, cytotoxin
The specific cell surface receptors found on the surface of B lymphocytes are:
immunoglobulin molecules
Antibodies are secreted by _________________.
plasma cells
Cytotoxic T cells play a major role in the body's cell-mediated immune response. Cytotoxic T cells bind to an infected or abnormal cell in the body and _________________________________.
release perforins and granzymes which punch holes in the host cell to destroy it
Inactivated bacterial exotoxin is called a(an)_________________________;
toxoid
All lymphocytes, T cells and B cells, originate in the bone marrow.
true
Both B lymphocytes and T lymphocytes originate in the bone marrow.
true
