Four of the five animals listed below have parasitic
species. Select the exception.
a. planaria
b. flukes
c. nematodes
d. leeches
e. tapeworms
Answer: a
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Supercoiling has been observed in:
A. chromosomal DNA. B plasmid DNA. C. genomes of double-stranded DNA viruses. D. most circumstances where double-stranded DNA is present in the cell. E. most circumstances of double-stranded cellular DNA, but not double-stranded viral DNA.
Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. orientation with respect to the Earth's magnetic field B. move to other bacteria and aggregate with them in response to chemical signals C. respond to light with the aid of flotation devices D. respond to other individual bacteria and transmit DNA via conjugation E. none of the other options presented
Species interactions between members of a community include __________ and __________, in both of which one
species benefits at the expense of another. Fill in the blank(s) with the appropriate word(s).
Which of the following is a sign of disease?
A. headache B. dizziness C. fever D. nausea E. cramps