Which of the following techniques allows an investigator to start with a single

Question

Which of the following techniques allows an investigator to start with a single piece of DNA and produce billions of copies in a matter of hours a. transduction b. gene cloning c. polymerase chain reaction d. recombinant technology Symptoms of AIDS usually appear when CD4 counts fall below a. 1,000 cells per ul b. 350 cells per ul c. 200 cells per ul d. 500 cells per ul Which part of the antibody molecule reacts with the antigenic determinants of the antigen a. hinge b. H chains c. constant sections of the H and L chains d. variable sections of the H and L chains The rapid increase in production of antibodies in response to a second or subsequent exposure to an antigen is known as a. a primary response b. the killer response c. a memory or anamnestic response d. inflammation e. dose response Macrophages play an important role in the immune response because they present a "processed" antigen to lymphocytes a. true b. false A toxoid is a/an a. type of antibody that combines with a toxin b. type of enzyme that destroys toxins c. inactivated toxin d. type of bacterium that resists phagocytosis e. type of virus Antibody molecules a. have a basic structure made up of two light and two heavy chains b. have a basic structure made up of four equal protein chains c. are found in the fibrin fraction of the plasma d. are found in the albumin fraction of the serum IgE is an immunoglobulin that a. binds to the surfaces of mast cells b. crosses the placenta e. is produced by mast cells d. fixes complement and damages cells Biochemically, antibodies can be described as a. complex polysaccharides b. proteins of the globulin class c. serum proteins d. nucleoproteins

Explanation / Answer

1) polymerase chain reaction.

2) 200 cells per ul.

3) variable section of the heavy and light chains.

4) a memory or anamnestic response.

5) true.

6) inactivated toxin

7) have a basic structure made up of two heavy and two light chains.

8) binds to the surface of the mast cells.

9) proteins of the globulin class.

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