RecA can facilitate strand exchange with a variety of substrates in vitro. Which of the following is not one of these structures?
A. a linear, single-strand DNA invading a linear duplex DNA
B. a circular, single-strand DNA invading a linear duplex DNA
C. a linear DNA duplex containing a single-stranded gap invading a linear duplex DNA
D. a linear, double-stranded DNA invading a double-stranded circular DNA
E. a linear DNA duplex containing a single-stranded gap invading a linear duplex DNA followed by branch migration to form a four-stranded intermediate
D
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Which of the following results in a spontaneous mutation?
A. free radicals produced by cellular metabolism B. exposure to ultraviolet light C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke D. exposure to ultraviolet light and benzo (a)-pyrene E. exposure to X-rays
What is the name of the mesoderm-derived, calcium-stiffened structures that comprise the internal skeleton of echinoderms?
a. ampullae b. ossicles c. madreporites d. radial canals
What are three lineages included in the SAR super group?
A. Stramenopiles, alveolates, and rhizarians B. Unikonta, alveolates, and rhizarians C. Alveolates, unikonta, and stramenopiles D. Stramenopiles, rhizarians, and unikonta E. Rhizarians, stramenopiles, and plankton
Which of the following is most likely to increase the risks of ASD?
A) exposure to environmental chemicals during pregnancy B) vaccination with the MMR vaccine C) poor parenting D) all of the above