________ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.
A. Fluorine
B. Iodine
C. Betadine
D. Bromine
E. Chlorine
Answer: E
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A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a:
A. protostome B. fimbrium C. lophophore D. trochophore E. rhizophore
Answer the following statements true (T) or false (F)
1. The membrane attack complex is involved in specific immune defense mechanisms. 2. During inflammation, nitric oxide secreted from endothelial cells causes swelling of the surrounding tissue. 3. The three major types of pathogens are bacteria, viruses, and cancer. 4. Helper T cells activate both B cells and cytotoxic T cells. 5. The first stage of a specific immune response is the activation of B cells and T cells.
In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened
to the membrane proteins? a. They formed a bilayer. b. They formed a spherical structure. c. They moved laterally across the cell surface. d. They flip-flopped from one layer to the other. e. They reacted with cholesterol molecules on the membrane surface.
Degradation of organic matter is influenced by ________.
A. nutrient availability B. the nature of the microbial community present C. abiotic conditions D. All of the choices are correct.