Pelagic snails that produce a bubble raft in order to remain afloat are
a. pteropods.
b. purple sea snails.
c. cowries.
d. littorine snails.
e. abalone.
B
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Which of the following does not characterize a synovial joint
A) Joint cavity filled with fibrous tissue B) Fibrous material forms a joint capsule C) Lubrication with a fluid D) A synovial membrane?
Noncyclic electron transport needs a constant supply of electrons. These are obtained from:a
light. b. CO2. c. glucose. d. H2O. e. ATP.
SCID is defined by a lack of functional B and T cells which eliminates protection by humoral and cell-mediated immunity. Which of the following is true?
A. Genes coding for B and T cell receptors are mutated so the cells are incapable of binding antigens. B. A genetic mutation renders the individual incapable of removing a toxic DNA metabolite from lymphocytes, which ultimately destroys them. C. Genes that code for interleukin receptors are mutated so the individual's B and T cells do not receive the activation signals, rendering them useless. D. A genetic defect disrupts the development of the lymphocytic cell lines. E. All of the above describe cases of SCID.
Which organ is responsible for metabolizing and detoxifying foreign chemicals in the blood, including drugs?
A. liver B. kidneys C. spleen D. stomach E. gallbladder