Which organ produces hormones that influence immune system activity?
a. brain
b. kidney
c. heart
d. thymus
e. bone
ANSWER: d
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An acoelomate is an animal that
A. has a coelom. B. has a pseudocoelom. C. has both a coelom and a pseudocoelom. D. has neither a coelom nor a pseudocoelom. E. has a coelom during early development but later loses it.
Enzymes work by ______ the activation energy required for a reaction to occur.
a. raising b. lowering c. keeping constant d. Enzymes don’t affect the activation energy of a reaction.
Which of the following is true for the mechanism of the 2Na+/glucose symporter?
A) Binding of 2 Na+ to the symporter open to the outside of the cell allows a glucose molecule outside the cell to bind. B) Binding of Na+ and glucose causes the symporter to open to the inside of the cell. C) Release of 2 Na+ ions to the inside of the cells causes release of the glucose molecule. D) Binding of 2 Na+ to the symporter on the inside of the cell causes the symporter to open to the outside of the cell and release of the Na+ ions. E) All of the above are steps in the mechanism.
Changes in both cell shape and cell position are involved with which process(es)?
A) gastrulation B) organogenesis C) cleavage D) A and B only E) A, B, and C