The sternum is a major site of red blood cell
formation. The bones in the sternum must be
___ bones.
a. compact
b. spongy
c. cartilaginous
d. fibrous
e. synovial
B
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The hydrogen ion gradient across the thylakoid membrane is required to ________________
What will be an ideal response?
True or False: The division of bilaterians into coelomate, acoelomate and pseudocoelomate groups is supported by molecular studies
A. true B. false
What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They associate with a protein bound to GDP or GTP. B. They are all linked to protein kinase activation. C. They change their conformation when bound to a hormone. D. They open ion channels. E. They bind similar hormones.
Sickle cell anemia is caused by a defect in the
A. ability of the blood to clot. B. chloride ion transport protein. C. ability of red blood cells to fight infection. D. oxygen-carrying pigment hemoglobin.