Exam 43: The Immune System

A certain cell type has existed in the blood and tissue of its vertebrate host's immune system for over 20 years. One day, it recognizes a newly arrived antigen and binds to it, subsequently triggering a secondary immune response in the body. Which of the following cell types most accurately describes this cell?

A patient who has a high level of mast cell activity, dilation of blood vessels, and acute drop in blood pressure is likely suffering from ________.

Within a differentiated B cell, the rearrangement of DNA sequences between variable regions and joining regions is accomplished by a(n)________.

A strain of fruit fly lacks the ability to produce Dicer-2 protein. You might expect this strain to be more susceptible to ________ infections.

The eyes and the respiratory tract are both protected against infections by ________.

________ are receptor molecules on mammalian cells that recognize macromolecules that are present in or on certain groups of pathogens.

Innate immunity ________.

Which of the following would not help a virus avoid triggering an adaptive immune response?

Which of the following are similarities between B cells and T cells? I They both recognize antigen using immunoglobulin receptors. II Both B cells and T cells undergo clonal selection after encountering an antigen. III B cells and T cells both maintain an immunological memory of previously encountered antigens.

Which of the following is crucial to activation of the adaptive immune response?

For the successful development of a vaccine to be used against a pathogen, it is necessary that ________.

An epitope associates with which part of an antigen receptor or antibody?

Jenner's successful use of cowpox virus as a vaccine against the smallpox virus was due to the fact that ________.

Acidity in human sweat is an example of ________.

Which of the following would help a virus avoid triggering an effective adaptive immune response? I.having frequent mutations in genes for surface proteins II.building the viral shell from host proteins III.producing proteins very similar to those of other viruses IV.infecting and killing helper T cells

Septic shock, a systemic response including high fever and low blood pressure, is a response to ________.

Use the following information to answer the question(s)below. An otherwise healthy student in your class was infected with EBV (the virus that causes infectious mononucleosis)when she was a child, at which time she had merely experienced a mild sore throat and swollen lymph nodes in her neck. When she is exposed to EBV again later in life, she does not get sick or have any symptoms of mononucleosis. Which of the following statements explains why your class mate does not exhibit symptoms of EBV infection?

Which of the following proteins can be classified as immunoglobulins? I T cell receptors II B cell receptors III Antigens

A patient complaining of watery, itchy eyes and sneezing after being given a flower bouquet as a birthday gift should first be treated with ________.

Yearly vaccination of humans for influenza viruses is necessary because ________.