Echinoderms are classified as Bilateria and they start out as bilateral larvae, yet as they develop they change into radially symmetrical adults. Would you expect their genes controlling the development of radial symmetry to be:
A. different from those controlling development of symmetry in all other radially symmetrical animals
B. similar to genes controlling body form in Porifera
C. similar to genes controlling body form in Ctenophora
D. similar to genes controlling body form in the lophophorates
E. similar to a common set of genes controlling body form in Ctenohora, and lophophorates
A. different from those controlling development of symmetry in all other radially symmetrical animals
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Stem cells have the ability to differentiate to form specific cell types, which divide only slowly or not at all
a. True b. False
Which endocrine gland is the main center for control of the internal environment?
A. Pineal B. Hypothalamus C. Thyroid D. Adrenal cortex E. Thalamus
The word “echinoderm” refers to
a. rounded skin b. smooth skin c. crusty skin d. spiny skin e. none of the above
The mediator protein complex in eukaryotes
A. is composed of a single protein. B. facilitates interactions between RNA polymerase II and regulatory transcription factors. C. controls the rate at which RNA polymerase translates mRNA. D. completely enfolds RNA polymerase and the general transcription factors.