Species in the ____ Lophotrochozoan phylum have a body divided into three regions: visceral mass, head-foot, and
mantle.
a. Rotifera
b. Mollusca
c. Platyhelminthes
d. Annelida
e. Nemertea
ANSWER: b
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In mapping the HD gene associated with Huntington disease, eventually researchers narrowed down their hunt to four candidate genes within the mapped region. How did they identify one of these as the definitive HD gene?
What will be an ideal response?
Action potentials travel down nonmyelinated axons at ________ action potentials travel down myelinated axons.
A. variable speeds, sometimes faster and sometimes slower than B. slower speeds than C. faster speeds than D. the same speed
The virulence of an organism may be enhanced by all of the following except
A. Its ability to spread through the tissues B. Its ability to escape from the phagosome C. Its ability to overcome body defenses D. Its ability to produce exotoxins E. Its ability to grow on artificial laboratory media
Attaches baby to the placenta and mother
What will be an ideal response?