单项选择题

Which of the following is true about the expressed sequence tags

A．They are difficult to mark' off.
B．They contain unidentified genetic information.
C．They contain the entire human genetic information.
D．They are genes whose specific functions have been identified.
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单项选择题
Laying claim to DNA stretches can be careless genetics because ______.
A．those who patent gene fragments are not qualified geneticists
B．the same gene fragments are often patented by different scientists
C．geneticists have no idea what they are going to do with patented genes
D．some of the gene fragments patented contain no real genetic information
单项选择题
The author is primarily concerned with ______.
A．refuting a claim about the influence of Puritan culture on the early American South
B．refuting a thesis about the distinctiveness of the culture of the early American South
C．challenging the hypothesis that early American culture was homogeneous in nature
D．refuting the two premises that underlie Davis' discussion of the culture of the American South
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