Parathyroid hormone (parathormone)
What will be an ideal response?
Produced by parathyroid glands in response to low blood calcium levels. Stimulates osteoclasts to resorb bone. Calcium is released into blood, raising levels. PTH secretion stops when homeostatic calcium levels are reached.
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Who is credited with demonstrating unidirectional and nonreciprocal transfer of DNA between two mating E. coli cells?
A. Tatum B. Hayes C. Lederberg D. None of the choices are correct.
________ is the process by which internal and external structures of cells and organisms are preserved and maintained in position.
Fill in the blank(s) with the appropriate word(s).
A true predator is a species that
A) feeds upon any part of any organism, not necessarily killing it. B) feeds only on animals. C) kills its prey more or less immediately upon capture. D) feeds on dead or living prey.
The attraction of water molecules to other molecules is called
a) adhesion. b) cohesion. c) capillary action. d) transpiration pull.