A person with type A blood can safely donate RBCs to someone of type ________ and can receive RBCs from someone of type ________.
A. O; AB
B. A; B
C. AB; O
D. O; O
E. B; A
Answer: C
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When an enzyme catalyzing a catabolic reaction changes conformation to an induced fit with the substrate,
A. it strengthens the chemical bonds in the enzyme so that it remains perpetually active. B. it stresses chemical bonds in the substrate, making it easier to break them. C. it strengthens chemical bonds in the substrate so that cofactors can act on it. D. it stresses chemical bonds in the enzyme so that the enzyme breaks into two catalytic subunits.
The afterhyperpolarization that follows the action potential:
A. is due to the inactivation of voltage-gated Na+ channels B. makes it easier to trigger another action potential C. extends the relative refractory period D. makes it impossible to fire another action potential E. is the consequence of continuing K+ influx
The figure illustrates a lateral view of the right eyeball. What does "C" represent?
A. inferior oblique B. lateral rectus C. superior oblique D. superior rectus E. inferior rectus
Most congenital birth defects are caused by
A. inherited traits. B. lack of oxygen to the fetus. C. viral infections during pregnancy. D. unknown causes. E. None of these choices is correct.