Osteogenic cells
What will be an ideal response?
Also called osteoprogenitor cells, mitotically active stem cells in periosteum and endosteum. When stimulated, they differentiate into osteoblasts or bone-lining cells. Some remain as osteogenic stem cells.
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Transplants of organs or tissues from two genetically unrelated organisms is known as a(n)
A) allograft. B) chimerigraft. C) transgenic animal. D) xenograft. E) none of the above
Biogeochemical cycles involve
A. the movement of chemicals through ecosystems. B. just those nutrients that are limiting for organisms. C. the nutrients used solely by primary producers D. all chemical elements plus light energy. E. None of these choices are correct.
What is the purpose of the null hypothesis in experimental design?
What will be an ideal response?
The primary function of spongy mesophyll is:
a. photosynthesis. b. transpiration. c. to allow diffusion of gases. d. transport of substances. e. transport of water.