This animal is acoelomate, hermaphroditic, and
adds new segments to its body as it grows.
This animal is ___.
a. a planarian
b. a tapeworm
c. a fluke
d. an earthworm
e. more than one of these
B
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Explain the tuberculin test, including visual identification and immunological interpretation of positive and negative results, and describe why a positive test does not indicate an active infection
What will be an ideal response?
A histone code is:
A. the nucleotide sequence of an individual histone protein's gene. B. the pattern of chemical modification of the DNA wrapped around an individual histone. C. the pattern of chemical modification of an individual histone's tail. D. the number of lysines in an individual histone that are methylated. E. None of the answer choices are correct.
Prions require more extensive methods of sterilization than are needed for bacterial endospores.
Answer the following statement true (T) or false (F)
Ecosystems obtain essential raw materials from
a. the components of water molecules. b. mineral ions dissolved in water. c. the weathering of rocks. d. the atmosphere. e. all of these.