HeLa cells allowed a formal identification of

the causative agent of



a. cholera.
b. polio.
c. chickenpox.
d. Lassa fever.
e. smallpox


B

Biology & Microbiology

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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

Biology & Microbiology

When similar structures arise indecently in different species, it is called __________________.

A. Convergent evolution B. Divergent evolution C. Mutation D. Vicariance E. Natural selection

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology