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.

Biology & Microbiology

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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.

Biology & Microbiology

Weakened bones, kidney stones, and malfunctioning muscles are symptoms of

a. hyperthyroidism. b. Grave's disease. c. acromegaly. d. hyperparathyroidism. e. Wilson's disease.

Biology & Microbiology

Carbolfuchsin is the ________ in the acid-fast stain

A) primary stain B) mordant C) decolorizer D) counterstain E) fixing reagent

Biology & Microbiology

One nucleotide contains

A. one pentose. B. one phosphate. C. one nitrogen base. D. All of these choices are correct.

Biology & Microbiology