Which type of change in chromosome structure characterizes cri du chat syndrome?
A. duplication
B. inversion
C. trisomy
D. translocation
E. deletion
Answer: E
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Which glial cell(s) is/are only found in the peripheral nervous system?
a. Schwann cells b. oligodendrocytes c. astrocytes d. Schwann cells and oligodendrocytes e. Schwann cells and astrocytes
In adult vertebrates, which of these is not one of the four principal kinds of primary tissues?
A. Epithelial B. Muscle C. Nerve D. Supportive E. Connective
In smooth muscle cells, acetylcholine stimulates activation of the enzyme ________, which cleaves ________ to form the second messengers ________ and ________
Fill in the blank with correct word.
How does PTEN affect the balance between proapoptotic and antiapoptotic signals?
a) PTEN cuts a phosphate group off of PKB, which throws the balance in an antiapoptotic direction. b) PTEN removes the phosphate group from the 3-position of PIP3, converting it to PI(4,5)P2, which cannot activate PKB (AKT) and thus throws the balance in an antiapoptotic direction. c) PTEN removes the phosphate group from the 3-position of PIP3, converting it to PI(4,5)P2, which cannot activate PKB (AKT) and thus throws the balance in a proapoptotic direction. d) PTEN cuts a phosphate group off of PKB, which throws the balance in a proapoptotic direction.