The chief functions of the inflammatory response include
A) bringing immune components to injury via cytokines.
B) initiate mechanisms to repair tissue.
C) destroy and block invasion of microbes.
D) all of the above.
Ans: D) all of the above.
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The metal atom bound to the heme group of hemoglobin is
A. iron. B. copper. C. manganese. D. zinc. E. sodium.
Antigen receptors are capable of producing large
diversity due to the fact that there are __________ cassettes (versions) of each __________. Fill in the blank(s) with the appropriate word(s).
How does a shark's cardiovascular system differ from that of a mammal?
A) The shark's heart does not directly pump oxygenated blood to the systemic tissues. B) The shark's heart receives both oxygenated and deoxygenated blood. C) The shark's circulatory system has a pulmonary and a systemic circuit. D) The shark's blood is pumped through open-ended tubes.
Which of the following statements is true?
(a) Ubiquinone is a small, hydrophobic protein containing a metal group that acts as an electron carrier. (b) A 2Fe2S iron–sulfur center carries one electron, whereas a 4Fe4S center carries two. (c) Iron–sulfur centers generally have a higher redox potential than do cytochromes. (d) Mitochondrial electron carriers with the highest redox potential generally contain copper ions and/or heme groups.