HeLa cells allowed a formal identification of
the causative agent of
a. cholera.
b. polio.
c. chickenpox.
d. Lassa fever.
e. smallpox
B
You might also like to view...
Lateral meristems
a. are groups of dividing cells. b. are responsible for increases in the width of a stem or root. c. are also called cambia. d. produce secondary growth only. e. include all of these characteristics
Which is characteristic of the adult thymus?
A. Continuing growth, corresponding to numerous infections over time B. Fusion of its lobes into a single lobe C. Infiltration by adipocytes D. The adult thymus is identical in structure to the child's thymus E. Total degeneration; only children have thymus tissue
The deposits of chalky fossils that built the White Cliffs of Dover were formed by
A. dinoflagellates. B. diatoms. C. amoebozoans. D. foraminiferans. E. ciliates.
When similar structures arise indecently in different species, it is called __________________.
A. Convergent evolution B. Divergent evolution C. Mutation D. Vicariance E. Natural selection