A positive test was observed on a serum sample that resulted in the formation of a fine precipi-tate on a reaction card. The most likely organism serologically identified is:
a. Chlamydia trachomatis.
b. Bacillus anthracis.
c. Treponema pallidum.
d. Toxoplasma gondii.
C
A fine precipitate is formed with flocculation tests. The rapid plasma reagin (RPR) and Venereal Disease Research Laboratory (VDRL) are two types of flocculation assays that test for T. palli-dum, the causative agent of syphilis.
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In order to activate the cell mediated immune response, which event must occur?
a. A naïve helper T cell must bind to an antigen-presenting dendritic cell.
b. A naïve B cell must be activated in order to activate the effector helper T cell. c. A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell. d. A damaged or infected body cell must pass through a lymph node in order to activate T cells. e. Antibodies must bind to naïve helper T cells.
Four of the five choices listed below are participants
in photosynthesis. Select the exception. a. photosystem b. granum c. mitochondrion d. chloroplast e. thylakoid
Why did Mendel choose pea plants for his research?
A. Pea plants are self-pollinating but can be cross-fertilized easily. B. Pea plants have a short generation time. C. Many true-breeding varieties were available. D. Peas are easy to cultivate. E. All of these were important characteristics in Mendel's selection.
Which of the following is associated with the specific defenses of the body?
A) cell-mediated immunity B) phagocytosis C) interferons D) the inflammatory response E) the complement system