What method of birth control is the most effective?
a. Condom
b. Diaphragm
c. Spermicides
d. Withdrawal
e. Vasectomy
e
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F- strains of Escherichia coli
A) do not have an F factor. B) have the F factor as a plasmid. C) have an integrated F factor. D) transfer the F factor to other strains at a high frequency.
Victims of CO poisoning turn “classic cherry red” in ____ percent of cases
a. 90 b. 50 c. 20 d. 2 e. 0
Huffaker's experiment involving oranges showed
A) predators will always consume prey to extinction. B) prey will always outlast predators. C) with enough complexity, predator and prey populations will oscillate. D) both species use oranges for refuge.
A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are a little below normal, and no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is the likeliest diagnosis for this child?
A) Bruton-type agammaglobulinemia B) Grave's disease C) severe combined immune deficiency (SCID) D) systemic lupus erythematosus (SLE) E) hemolytic disease of the newborn