Nondisjunction of a single pair of autosomes can lead to all of the following except
A. aneuploidy.
B. monosomy.
C. trisomy.
D. euploidy.
D. euploidy.
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Reductive dechlorination is important in the breakdown of chlorinated xenobiotics because
A) anoxic conditions develop rapidly in polluted habitats. B) oxygen is not present in most soils. C) aerobic breakdown of xenobiotics is not possible. D) only cometabolism occurs aerobically.
The array of potential antibodies to the variety of possible antigens is amazing. Which statement explains this development?
A. Recombination of genes coding for the variable regions of immunoglobulins occurs during the developmental stage of lymphocyte production. B. The existing antibody molecules change their shapes, allowing them to fit with a large number of antigens. C. There is a shuffling of genes that code for self markers as well as nonself markers, mixing them together and producing reactive lymphocytes to those markers. D. Mutations in the antibody gene occur within the activated B cells, since they meet the antigen.
Eating undercooked meat can lead to food-borne disease via helminthic infection. What is the common host for Taenia solium?
A. Ducks B. Cows C. Chickens D. Geese E. Pigs
The most economically important bryophyte is:
a. Equisetum. b. Anthoceros. c. Psilotum. d. Sphagnum. e. Lycopodium