Which of the following is not involved in positional information for pattern formation?
A) apical ectodermal ridge
B) zone of polarizing activity
C) cadherins
D) fibroblast growth factors
E) Sonic hedgehog
Answer: C) cadherins
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The _______________________ , which is part of the nervous system, is also recognized as a major endocrine organ because it produces several hormones
Fill in the blank(s) with the appropriate word(s).
Which protist has a belt-like flagellum that runs through a groove in the middle of its cell?
a. dinoflagellates b. ciliates c. apicomplexans d. euglenoids e. trypanosomes
Homeotic genes generally control
a. X chromosome inactivation. b. formation of specific body parts c. hormone synthesis. d. dosage compensation. e. none of these.
In plants, production of NADPH
A. occurs in the absence of light. B. requires the production of a proton gradient. C. occurs during the Calvin cycle. D. requires electrons originally found in water.