If a human female has 2 Barr bodies per cell, it is almost certain that  

A.  her father had 1 Barr body per cell.
B.  her mother also had 2 Barr bodies per cell.
C.  she developed from a fertilized egg with 3 X chromosomes.
D.  she is genetically a male with female characteristics.
E.  she is genetically a normal fertile female.


C.  she developed from a fertilized egg with 3 X chromosomes.

Biology & Microbiology

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The DNA-binding proteins of almost all regulatory proteins use one of a small set of shapes that enable them to fit into the DNA major groove. These shapes are called  

A.  structural motifs. B.  DNA prints. C.  fingerprints. D.  repressors. E.  transcriptional domains.

Biology & Microbiology

At least two host races of apple maggots have appeared within the past 150 years, suggesting they may be undergoing

____.

a. parapatric speciation b. allopatric speciation c. sympatric speciation d. genetic drift e. development of a hybrid zone

Biology & Microbiology

Honeybees are ________ because they transfer pollen from one plant to another

a. pollinators b. polluters c. transporters d. impregnators e. reproducers

Biology & Microbiology

Which one of the following virulence factors contributes most to the spread of disease in the body?

A) endotoxin production B) siderophore production C) hemolysin D) hyaluronidase

Biology & Microbiology