When the blood level of calcium falls below normal, which hormone stimulates osteoclasts to break
down bone and release calcium?
a. growth hormone
b. thyroid hormone
c. calcitonin
d. thyroid hormone
e. PTH
E
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The synthesis and secretion of ____ is ultimately regulated by gonadotropin-releasing hormone from the ____
a. estrogen; posterior pituitary b. estrogen; ovaries
c. testosterone; hypothalamus d. testosterone; testes e. androgens; gonads
Which description best fits the current study of phylogeny?
a. indisputably correct descriptions of the evolutionary relationships between organisms based on complete knowledge of plant and animal genomes b. hypotheses about the evolutionary relationships between organisms based exclusively on morphological and fossil record data c. hypotheses about the evolutionary relationships between organisms based on a combination of molecular, morphological, and fossil record data d. a complete reorganization of past phylogenies based on molecular data that has invalidated and superseded all phylogenetic trees based on morphology
An array of organisms together with their
physical environment is which of the following?
a. population b. community c. ecosystem d. biosphere e. landscape
What are two commonly used DNA landmarks for mapping human genes?
What will be an ideal response?