Rings of cartilage provide strength and support to keep what structure open?
a. alveoli
b. larynx
c. trachea
d. pharynx
c. trachea
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What experiment led to an understanding by Kornberg that DNA acted as a template for DNA synthesis?
What will be an ideal response?
Intertidal soft bottoms are unstable due to:
a. wave action. b. erosion. c. changing tides. d. currents. e. all of the above.
The ____ of flagellated protozoans are analogous to the ____ of prokaryotes
a. cytoskeleton; flagellum b. endoplasmic reticulum; ribosome c. fimbriae; Golgi body d. pellicle; cell wall e. cytoskeleton; plastid
An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) Without this treatment, the mother's immune system will attack only her own blood cells. B) Without this treatment, antibodies will be formed in breast milk, which could harm the baby. C) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. D) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy.