Which of the following proteins exerts direct control over the glycogen synthesis and breakdown pathways when epinephrine stimulates glycogen conversion to glucose in liver cells?
A) glycogen phosphorylase
B) phosphorylase kinase
C) protein kinase A
D) cAMP phosphodiesterase
E) glycogen synthase
Answer: C
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A. cAMP B. IP3 C. protein kinase A (PKA) D. protein kinase C (PKC)
Which of the following tests is not used to screen for colon cancer?
A. digital examination B. double-contrast barium enema C. flexible sigmoidoscopy D. blood test E. fecal occult blood test
Which of the following is NOT a characteristic of osmosis?
a. water flows from low solute concentration to high solute concentration b. occurs across a membrane freely permeable to water c. occurs across a membrane freely permeable to solutes d. passive process
________ membranes allow some molecules to pass but not others.
A. Permeable B. Selectively permeable C. Impermeable D. Inverted monolayer