An unusual, worldwide formation of sedimentary rock called the K–Pg boundary sequence contains rare elements that
are associated with a(n) ____.
a. volcanic eruption
b. worldwide flood
c. Ice Age
d. asteroid impact
e. large earthquake
ANSWER: d
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An endocrine gland is a type of organ
A. required for remodeling bone. B. where hormones are produced and then released into the blood. C. where neuronal signals are generated. D. restricted to the production of growth factors. E. None of the choices are correct.
A person whose cells all contain a chromosome number of 2n+1 most likely has what type of condition?
A. Trisomy B. Obesity C. Cancer D. Monosomy E. None, this is the normal chromosome number for humans.
The condition in which there is only one representative of a particular chromosome in a cell is called ________
Fill in the blank(s) with correct word
Vibrio cholerae lives in water and gets toxin genes from a virus by phage conversion. The toxin kills the intestinal epithelial cells in the human host, resulting in massive diarrhea. Untreated cholera has about a 50% mortality rate. How do the bacteria benefit?
A. They don't -- humans are not the main host and their symptoms are maladaptive for the bacteria. B. The bacteria reproduce faster in a dead human. C. Diarrhea helps the bacteria to spread from person to person. D. Killing humans provides nutrients for the bacteria.