According to research done by Baron, Caughey, and Prado, how do prions move within the brain?
a. They use receptors on the surfaces of nerve cells.
b. They use vesicles found inside the nerve cells.
c. They use tunneling nanotubes.
d. They pinch off the nerve cell membrane.
e. They stick to the outer surfaces of nerve cells.
C
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There are exceptions to the general rule that amphibians lay eggs that develop in the water. These exceptions showed extreme variation but they do have one thing in common. What is it?
A. They all develop in some sort of pouch. B. They all develop in desert environments. C. They all develop in habitats with adequate humidity. D. They all develop in a camouflaged environment. E. They all develop more slowly than eggs developed in water.
Where would we find yellow bone marrow?
A) in the flat bones of the skull B) surrounding the outside of the long bones C) surrounding the outside of the flat bones D) in the shaft of the long bones
Actin filaments are anchored at junctions called
a. adherens junctions. b. tight junctions. c. desmosomes. d. gap junctions. e. hemidesmosomes.
A diagnostic test for congenital defects of the ureter, bladder, and urethra includes:
A) Excretory urography. B) Prenatal ultrasound. C) MRI. D) Biopsy of the affected part.