A bacterium, containing one circular DNA chromosome, undergoes four rounds of replication. How many new strands of DNA would result?
A. 8
B. 14
C. 16
D. 24
E. 32
Answer: B
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Which of the following is true of species diversity over time?
1.The distribution pattern of protozoans most closely matches that of insects.
2.Angiosperm diversity in the Paleozoic most closely matches that of insects.
3.Trilobites expanded in the Mesozoic before going extinct.
4.Insects have had the greatest species expansion during the Cenozoic.
Cephalopods have an open circulatory system
____________________ Indicate whether the statement is true or false.
Which of the following is not a region of the vertebral column?
a. sacral region b. thoracic region c. cervical region d. coccygeal region e. cranial region
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.