In the context of cell communication, to what does the term ligand refer?
A. a signaling molecule
B. the extracellular domain of a receptor
protein
C. the proteins activated as part of a signal
transduction pathway
D. a type of gated channel
A
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Approximately how much of the human genome varies between individuals?
A. 99.9% B. 97.0% C. 50.0% D. 3.0% E. 0.1%
The function of BMP4 is to ____________ while the function of gremlin is to __________ BMP4.
A. cause apoptosis (cell death); inhibit. B. cause mitosis; enhance production of. C. inhibit growth; enhance. D. enhance growth; enhance. E. cause apoptosis (cell death); enhance.
In the open ocean, ________.
A. Archaea are not present B. Archaea are only found in extreme environments such as near thermal vents C. the relative abundance of Archaea versus Bacteria decreases with depth D. the relative abundance of Archaea versus Bacteria increases with depth
The portion of the bone labeled B in Figure 40-3 is called:
a. the periosteum.
b. the diaphysis.
c. the epiphysis.
d. compact bone.
e. metaphysis.