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

Biology & Microbiology

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The hydrogen ion gradient across the thylakoid membrane is required to ________________

What will be an ideal response?

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True or False: The division of bilaterians into coelomate, acoelomate and pseudocoelomate groups is supported by molecular studies

A. true B. false

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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.

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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.

Biology & Microbiology