Iron
a. can combine reversibly with O2.
b. deficiency can produce anemia.
c. is converted into bilirubin and secreted into the bile when an old red blood cell ruptures and is degraded.
d. both (a) and (b) above.
e. all of these answers.
D
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The primary structure of a protein consists of
a) alpha helices. b) beta-pleated sheets. c) three dimensional folded conformation. d) a sequence of amino acids linked by peptide bonds. e) the overall folded conformation of the protein's subunits.
Which of the following acts as a chemical catalyst?
a. DNA b. RNA c. enzymes d. phospholipids
A person has alkalosis if the blood pH
A) is below 7.0. B) rises above 7.5. C) drops below 7.3. D) is above 7.0.
The swellings on postganglionic axons that contain neurotransmitter are called ________.
A. synaptic bulbs B. axon terminals C. neuromuscular junctions D. varicosities