If a psychiatric condition displays 15% concordance in monozygotic twins, and 8% concordance in dizygotic twins,
then genetics plays a major role in this trait.
a. True
b. False
False
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World human population in 2009 is approximately
A. 670 million. B. 1.8 bilion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.
Perchlorate contamination of waterways causes which of the following problems in frogs?
a. male frogs with both male and female sex organs b. excessive growth c. interference with the metabolism of iodine d. low blood calcium and slowed bone formation
Mammals are diphydonts, which means that they have:
a. teeth that can be replaced throughout their lifetime. b. two kinds of keratin that form into distinct kinds of hairs. c. two different types of teeth that perform different functions. d. two sets of teeth in their lifetime.
How many nucleotides are contained in a single codon?
A. three B. four C. nine D. one E. six