The responsiveness of cells to calcitonin increase as an individual ages; maximum responsiveness occurs in elderly individuals as a mechanism to improve the stability and strength of bones.
a. true
b. false
Answer: b. false
You might also like to view...
A new species, ________, was recently shown to have two membranes, like a Gram-negative bacterium, but be phylogenetically related to the Gram-positive family Veillonellaceae.
Fill in the blank(s) with the appropriate word(s).
If a sperm cell containing a defective copy of the gene on the Y chromosome that encodes testosterone fertilizes an egg, what effect will this have on the developing embryo?
a. There will be no effect so long as the X chromosome is intact. b. The cells of the embryo will undergo apoptosis early in development. c. The embryo will develop female sexual tissues and characteristics. d. Increased hair growth will begin in utero and continue until adolescence.
Voltage-gated ion channels open when a protein binds to the receptor.
a. true b. false
The main causes of the loss of plant biodiversity include
A) plant diseases and clear-cutting of forests to create farmland. B) herbivory, logging, and air pollution. C) deforestation by clear-cutting or burning of forests to create farmland. D) plant diseases and herbivory.