A G protein:
A. is a component of a signal-transduction
pathway that is coupled to a G proteincoupled
receptor.
B. is composed of three subunits and is
inactive when bound to GDP.
C. releases GDP and binds to GTP when
associated with an activated receptor.
D. becomes deactivated when bound GTP is
dephosphorylated to GDP.
E. All of these choices are correct.
E
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A normal event in the process of blood clotting is the _____
A) production of erythropoietin B) conversion of fibrin to fibrinogen C) activation of prothrombin to thrombin D) increase in platelets E) synthesis of hemoglobin
All mammals except the metatherians are viviparous
Indicate whether the statement is true or false.
Mammals and dinosaurs did not live during the same time period.
Answer the following statement true (T) or false (F)
Plants called legumes have chambers in their roots that house nitrogen-fixing bacteria. Nitrogen-fixing bacteria get both a place to live and energy while supplying nitrogen to a plant. What is this ecological relationship called?
A) Competition B) Parasitism C) Succession D) Predation E) Mutualism