The relationship between the insect hormones ecdysteroid and PTTH is an example of _____
A) an interaction of the endocrine and nervous systems
B) competitive inhibition of a hormone receptor
C) how peptide-derived hormones have more widespread effects than steroid hormones
D) homeostasis maintained by antagonistic hormones
A
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Which of the following amino acids has an aromatic R group?
A. aspartate B. proline C. threonine D. tyrosine E. arginine
Amniocentesis involves sampling ____
a. the embryo at the eight cell stage b. fetal cells in the amniotic fluid c. sperm or egg cells d. fetal skin tissue e. placental cells
You discover a primate fossil while on an expedition in Africa. Which part of the skeleton should be examined to classify this fossil as a human or a nonhuman primate?
A) the hand bones B) the base of the skull C) the ribs D) the backbone (vertebrae)
Much has been written about p53 in terms of cancer biology. What is p53, and what is its significance?
What will be an ideal response?