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
In the last paragraph, the author implies that ______.
A．anatomists and geneticists are morally questionable
B．genes are as much a part of a human form as pancreas
C．the pancreas has greater human importance than genes
D．people are more interested in patenting genes than pancreas
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