Structures that have no apparent function but had a function in ancestral species are
A. the fossil record.
B. the molecular record.
C. homology.
D. development.
E. vestigial structures.
E. vestigial structures.
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Which of the following isnot true of the fruit fly Hedgehog (Hh) protein?
A. Hh is a member of the Wnt signaling pathway. B. Hh expression is activated by the transcription factor engrailed (en). C. Hh is secreted and interacts with Wg-producing cell receptors. D. Hh functions as a signaling molecule at segment boundaries.
Weakened bones, kidney stones, and malfunctioning muscles are symptoms of
a. hyperthyroidism. b. Grave's disease. c. acromegaly. d. hyperparathyroidism. e. Wilson's disease.
Carbolfuchsin is the ________ in the acid-fast stain
A) primary stain B) mordant C) decolorizer D) counterstain E) fixing reagent
One nucleotide contains
A. one pentose. B. one phosphate. C. one nitrogen base. D. All of these choices are correct.