What genetic evidence can demonstrate that some developmental events are due to chemical signaling?
What will be an ideal response?
In many instances, a developmental event requires that nearby tissue be intact and actively releasing a chemical signal. The inductive signals may be lost when an "anchor cell" is ablated, and further development is inhibited when the chemical signal is lost. In addition, mutations that cause that inductive chemical signal to be disseminated to additional cells can result in multiple structures forming, indicating that it is the presence of the chemical and its activation of gene pathways that encourages developmental events, resulting in the formation of specific cell structures.
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A synapse is
A) a close association between neurons. B) a neurotransmitter molecule. C) a type of protein. D) a gene that controls the nervous system.
Hormones produced by endocrine glands are typically transported to target cells:a
across a synapse. b. in the blood. c. in interstitial fluid. d. via direct contact. e. through the air.
Which of the following is one function of the developing follicle?
a. to secrete gonadotropin-releasing hormone b. to stimulate ovulation c. to secrete progesterone d. to secrete estrogens
Arthroscopic surgery is used to repair damage to the knee. What sorts of things can go wrong that can lead to damage in someone's knee?
What will be an ideal response?