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.

Biology & Microbiology

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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.

Biology & Microbiology

Four of the five choices listed below are participants

in photosynthesis. Select the exception. a. photosystem b. granum c. mitochondrion d. chloroplast e. thylakoid

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology