How does a chemical catalyst increase the rate of a reaction?
A. By decreasing the energy of activation
B. By acting as one of the reactant molecules
C. By phosphorylating a reactant
D. By increasing the temperature of a solution
E. By increasing the energy content of the product molecules
Answer: A
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The oral cavity is a part of which body system?
A) digestive B) nervous C) urinary D) respiratory
An action potential requires ______
A) voltage-gated sodium channels to open B) sodium to flow with its electrochemical gradient C) chemically gated sodium channels to open D) voltage-gated sodium channels to open and sodium to flow with its electrochemical gradient
Most primates are ________, meaning they live in trees.
A. prehensile B. cursorial C. bipedal D. troglodytic E. arboreal
The role of the hormone erythropoietin is to:
a. stimulate red blood cell production b. increase urine volume c. increase frequency of urination d. draw sodium out of the plasma e. combat dehydration