Which is incorrect about the Fc region of an immunoglobulin?
A) It determines the class to which the immunoglobulin belongs.
B) It determines the antibody's distribution in the body.
C) It contains an effector molecule that can fix complement.
D) It contains an effector molecule that can bind to cells such as macrophages and mast cells.
E) It forms the antigen binding sites.
E) It forms the antigen binding sites.
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The eradication of malaria in Europe resulted from a specific breakthrough in the science of
a. systematics. b. ecology. c. evolutionary studies. d. pest control. e. sanitation.
Which is true concerning cell division?
A. During meiosis I, sister chromatids pair up and then are separated. B. During crossing over, an allele for brown eyes may be switched with an allele for brown hair. C. An asexually reproducing organism needs mitosis to produce a genetically diverse set of daughter cells in order to maintain genetic diversity. D. When comparing the parent and daughter cells, meiosis differs in both the ploidy level and ploidy number, whereas mitosis differs in neither.
Lipid soluble molecules are expected to cross the cell membrane by way of:
A. simple diffusion B. signal transduction C. facilitated diffusion D. active transport E. group translocation
The specialized cells in the nervous system that serve to conduct a signal are known as
A. neuroglia. B. dendrocytes. C. Schwann cells. D. astrocytes. E. neurons.