Which of the following is NOT closely related to any
of the other four?
a. turbellarians
b. earthworms
c. flukes
d. tapeworms
e. planarians
Answer: b
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The products of endocrine glands
a. only affect their own tissue. b. provide feedback by paracrine action. c. always stimulate the target tissue. d. reach their target tissues via the circulation system. e. are released into body fluids, then into the circulation system.
In a cross of Ss x Ss, the probability of having a heterozygous genotype is
A. 3/4. B. 1/4. C. 1/3. D. 2/3. E. 1/2.
The progression through the cell cycle is highly regulated to ensure that the ______ is intact and the conditions are appropriate for a cell to divide.
Fill in the blank(s) with the appropriate word(s).
A protozoan cyst differs from a helminth egg in that
A. the chromosome is free in the cytoplasm of a cyst, but enclosed in a nucleus in an egg. B. a cyst is metabolically active, but an egg is not. C. the cyst can germinate to form the organism but the egg must be fertilized. D. cysts have a uniform structure, but eggs have a wide variety of morphologies.