Why are the master genes of embryonic development so highly conserved?
What will be an ideal response?
The development of an embryo into a body plan is controlled by layer after layer of master gene expression. The failure of any single master gene to participate can result in a drastically altered body plan. Because a mutation in a master gene typically unravels development completely, these genes tend to be highly conserved.
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Second messengers:
A. are small intracellular molecules that participate in signal transduction. B. play a role in activation of intracellular signal transduction. C. are removed in order to terminate a cellular signaling response. D. amplify the effects of the signal. E. All of these choices are correct.
What are the benefits and costs to animals that excrete uric acid?
What will be an ideal response?
The most primitive group of animals that had lungs were the:
a. amphibians. b. ray-finned fish. c. reptiles. d. birds. e. tunicates.
Thick, smooth muscle located at the junction of the bladder and urethra that aids in pushing stored urine into the urethra is called the ________
A) medial urethral sphincter B) internal urethral sphincter C) external urethral sphincter D) urinary sphincter