The major categories of hypersensitivities that typically involve a B-cell immunoglobulin response is/are
A. Type 1 only.
B. Type 4 only.
C. Type 1, Type 2, Type 3.
D. Type 1 and Type 4.
E. Type 1, Type 2, Type 3, and Type 4.
Answer: C
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What cytokine is secreted by active T cells and natural killer cells, and inhibits viral replication, enhances phagocytosis in macrophages, boosts production of antibodies by B cells, and activates both natural killer cells and cytotoxic T cells?
A) interleukin-4 B) interleukin-10 C) interferon-alpha D) interferon-gamma E) interleukin-5
Of the following list, flagellated (swimming) sperm are generally present in which groups?
1. Lycophyta 2. Bryophyta 3. Angiosperms 4. Chlorophyta 5. Pterophyta A) 1, 2, 3 B) 1, 2, 4, 5 C) 1, 3, 4, 5 D) 2, 3, 5 E) 2, 3, 4, 5
According to one hypothesis, the first eukaryotic cells originated by
A. spontaneous generation. B. biogenesis. C. endosymbiosis. D. mitosis.
Oxidative phosphorylation requires all of the items listed below except
A) ATP synthase in the correct position in the membrane. B) enzyme complexes embedded in a membrane. C) the flow of electrons from NADH and QH2 in the membrane. D) a matrix more positively charged than the intermembrane space. E) a terminal electron acceptor which is O2 in mitochondria.