Phylogenetic relationships, when determined solely by the study of comparative morphology, may be
incorrect due to
a. morphological divergence.
b. convergence.
c. adaptive radiation.
d. extinction.
e. observer error.
B
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Which bacillus-shaped genus are primarily intracellular parasites of arthropods such as crustaceans and insects?
A) Coxiella B) Klebsiella C) Roseospirillum D) Wolbachia
Through evolution, the hindlimbs of cetaceans have been modified, eventually becoming
a. flippers. b. tail. c. non-existent. d. flukes. e. enlarged.
This hormone binds to a plasma membrane
receptor and has its effect by way of a second messenger. This hormone is
a. aldosterone. b. calcitonin. c. progesterone. d. cortisol. e. more than one of these
The essence of meiosis is that
a. one gamete receives the maternal chromosomes, and the other gamete receives the paternal chromosomes. b. diploid gametes are formed. c. gametes are formed after one cell division. d. diploid spores are formed. e. haploid gametes are formed.