Which of the following essential nutrients plays an critical role in the opening and closing of the stomatal aperture?
A) Fe
B) Bo
C) Mg
D) H
E) K
Answer: E
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Describe the carbon cycle from the atmosphere to the primary producers and back again.
What will be an ideal response?
Which of the following structures and functions is not associated with plasma proteins in a mammal?
a. pH buffering b. Oxygen transport c. Osmotic balance d. Clotting agent e. Antibody
The term mixotroph indicates that an organism __________.
a. can be both photoautotrophic and autotrophic b. can be both parasitic and free-living c. can be both heterotrophic and autotrophic d. has both unicellular and multicellular parts of its life cycle e. has both bacterial and archaeal features as a result of endosymbiosis
Which fastidious genus requires hemin (X factor) and NAD (X factor) in its growth medium?
A. Legionella B. Haemophilus C. Brucella D. Shigella E. All of the choices are correct