HeLa cells are
a. normal cells.
b. stem cells.
c. cancer cells.
d. viral-infected cells.
e. bacterial cells
C
You might also like to view...
The stem axis of the embryo below the cotyledons in some seedlings.
Choose the LETTER of the best match: A. hypocotyl B. endosperm C. scutellum D. radicle E. epicotyl
Interneurons in the spinal cord release ____ when signals from pain receptors reach them
a. bradykinins. b. histamines. c. prostaglandins. d. substance P. e. leukotrienes.
Old cemeteries (pre-1900 ) often have gravestones that often host many types of lichens. However, it is not impossible to find old cemeteries where lichens are entirely absent. Given what is known about lichens, an old cemetery without lichens probably
A) has an unusually dry climate. B) is subject to extremely cold winter temperatures. C) gets a great deal of rain, which favors the growth of competing bacteria. D) is close to a source of air pollution.
What do echinoderms and chordates have in common?
A. Protostome development B. Endoskeletons C. Ecdysis D. Dorsal nerve cords