Nitrogen is made available to plants for their use by the process(es) of ____
a. ammonification only
b. nitrification only
c. nitrogen fixation only
d. ammonification and nitrification only
e. ammonification, nitrification, and nitrogen fixation
ANSWER: e
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Unfortunately, several of the children who were genetically treated for SCID-X1 have since developed
a. sickle cell anemia. b. diabetes. c. cystic fibrosis. d. hemophilia. e. leukemia.
Heating up a reaction increases the speed of a reaction until the ____
a. enzyme denatures b. heat changes the pH of the reaction c. maximum speed is achieved d. cofactors can't bind the enzyme e. reaction begins to experience feedback inhibition
Among air-breathing animals, why do birds have the most effective mechanism of extracting oxygen from air?
a. because their air sacs provide additional respiratory surfaces b. because birds utilize crosscurrent exchange c. because bird lungs are the largest among vertebrates d. because bird lungs have more surface area
Which of the following minerals are directly involved with light absorption in photosynthesis?
A) Zn B) Mg C) Fe D) Ca E) Na