Interrupted coding sequences include long sequences of bases that do not code for amino acids. These
noncoding sequences, called __________, are found in __________ cells.
a. exons; only prokaryotic
b. introns; only prokaryotic
c. exons; only eukaryotic
d. introns; only eukaryotic
e. exons; both prokaryotic and eukaryotic
D
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Which statement is true?
a. Morphology no longer informs phylogenetic classification. b. Cnidarians are the only organisms classified as Radiata. c. Phylogenetic trees are hypotheses, and frequently change. d. Mitochondrial DNA is only used to classify extinct organisms.
The spinal cord runs through the vertebral column and connects with the brain through the
__________. Fill in the blank(s) with the appropriate word(s).
__________ is the study of body plans and structures
among groups of organisms. a. Embryology b. Molecular archeology c. Evolution d. Comparative morphology e. Composition
Which of the following phyla is characterized by
radially symmetrical members? a. Arthropoda b. Cnidaria c. Platyhelminthes d. Chordata e. Annelida