Which of the following statements concerning vitamin D is false?
A. Vitamin D is necessary for the formation of bones and teeth.
B. Vitamin D causes the kidney to excrete calcium.
C. Vitamin D is important for calcium homeostasis.
D. Vitamin D is necessary for the uptake of calcium from the intestine.
E. Vitamin D begins its synthesis in the skin when the skin is exposed to ultraviolet light.
B
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What are the three important functions of the lipid bilayer of the plasma membrane?
a. forms the basic membrane structure; hydrophilic interior acts as barrier; aids in RNA transfer b. forms the basic membrane structure; hydrophobic interior acts as barrier; responsible for fluidity c. forms the basic membrane structure; hydrophobic interior acts as barrier; aids in RNA transfer d. allows electrical flow via nerves; hydrophobic interior acts as barrier; responsible for fluidity e. allows electrical flow via nerves; hydrophilic interior acts as barrier; responsible for fluidity
Which of the following would not present an foreign antigen within MHC-2 glycoproteins?
a. macrophage b. liver cell c. dendritic cell d. B cell e. Neither b nor d
Which of these descriptions best matches the term gastrin?
A) where pancreatic juice and bile enter duodenum B) carries absorbed sugars and amino acids C) stimulates pancreas to secrete bicarbonate-rich fluid D) causes gall bladder to contract E) stimulates gastric secretion
Which of the following muscles has an insertion on the mandible?
A. Platysma B. Masseter C. Temporalis D. All of these muscles insert on the mandible.