How long did it take in the history of life on Earth to go from the first prokaryotic cells to the first eukaryotic cells?
A) 1,000 years
B) 100,000 years
C) 1 million years
D) Over a billion years
D
You might also like to view...
Is it possible for a cell to contain more than one nucleus? Explain.
What will be an ideal response?
These data are from experiments in which bacteriophage DNA and protein were labeled with radioactive tracers and allowed to infect bacteria. The virus–bacteria mixtures were whirled in a blender to dislodge the viruses, and the tracers were tracked inside and outside of the bacteria. DNA contains much more phosphorus than do proteins; proteins contain much more sulfur than does DNA. The results
imply that:
1.equal amounts of bacteriophage protein and DNA entered the infected bacteria
2.more protein entered the bacteria
3.more DNA entered the bacteria
4.neither protein nor DNA entered the bacteria
During the first major divergence of life the
atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from anaerobic to aerobic. d. firmly in the age of aerobes. e. all of these.
A species of the genus Streptococcus is the leading cause of
A. tuberculosis. B. urinary tract infections. C. contaminated milk and meat. D. "flesh-eating" bacterial infections. E. food poisoning from rice.