In addition to IgG, the antibodies that can fix complement are
A) IgM.
B) IgA.
C) IgD.
D) IgE.
E) None of the answers is correct.
A
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Antitoxins
A. are always genetically engineered. B. confer passive immunity. C. contain select antigenic components of a pathogen rather than whole cells or viruses. D. contain modified bacterial exotoxin molecules. E. utilize DNA strands that will produce the antigen.
Plasmodesmata in plant cells are most similar in function to which of the following structures in animal cells?
A) desmosomes B) gap junctions C) extracellular matrix D) tight junctions
A karyotype is a physical representation (usually a photograph) of all of the chromosomes in a single cell; however, the cell must be in mitotic metaphase when the karyotype is made. Why?
a) Metaphase is the only stage of the cell cycle in which single chromosomes move toward the poles. b) Metaphase is the only stage of the cell cycle in which the cell membrane is permeable to dye. c) Metaphase is the only stage of the cell cycle in which both sets of homologous chromosomes are present in the cell. d) Metaphase is the only stage of the cell cycle in which the chromosomes have condensed and aligned, but have not yet separated. e) Metaphase is the only stage of the cell cycle in which both sister chromatids of each chromosome are present in the cell.
The high heat of vaporization of water helps you to feel cooler when you sweat because the transition of water from a liquid to a gas requires a ________ of energy to break hydrogen bonds. The energy is ________ from heat produced by your body, thus helping to lower the surface temperature of your body.
A. input; released B. release; obtained C. input; obtained D. release; released