Which of the following is NOT involved in
periodontitis?
a. aerobic bacteria
b. Streptococcus mutans
c. a host of bacterial fermenters
d. organic acids
e. inflammation
Answer: a
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A new compound developed in the lab was tested as a DNA mutagen. When the Ames test was performed, the results were numerous bacterial colonies following exposure. This result means
A) the chemical is safe. B) the chemical is radioactive. C) the chemical is a carcinogen and a low-level mutagen. D) the chemical is a mutagen and may also be a carcinogen. E) the chemical can be moved to human trials.
Homo erectus and the modern humans differ in
A. social behavior. B. living as tribes. C. their brain size. D. their upright posture. E. opposable thumbs.
In humans and some other vertebrates, the organ that collects sound and directs them to the auditory canal is called the ____.
A. auditory nerve B. cochlea C. eardrum D. pinna E. round window
Which new technology has advanced our understanding of large scale ocean features such as ocean currents?
A) Marine labs B) ROVs C) AUVs D) Remote sensing