Suppose you discover a new species of animal that does not have body segments, but is triploblastic, eucoelomate, and cephalized. Under the molecular phylogenetic scheme, you would allocate it to which phylum?
A. Mollusca.
B. Echinodermata.
C. Nematoda.
D. Platyhelminthes.
E. Arthropoda.
A. Mollusca.
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What is the primary characteristic that groups phyla within the Ecdysozoa?
A. They all have tropchophore larvae. B. They shed their exoskeletons. C. They all have spiral cleavage. D. They all have segmentation.
Where does binary fission begin?
a. the promoter region b. the metaphase plate c. the septum d. the origin
The only gene successfully targeted for breast cancer prevention is the
a. estrogen promoter gene. b. estrogen receptor gene. c. uterine promoter gene. d. uterine receptor gene. e. breast promoter gene.
Knockout experiments involving __________ genes
in fruit flies (Drosophila melanogaster) revealed local controls over gene expression. Fill in the blank(s) with the appropriate word(s).