How could the number of coexisting species within a community be increased?
A) increased total niche space (variety of resources)
B) increased niche overlap
C) increased specialization
D) A, B, C, or any combination of these
Ans: D) A, B, C, or any combination of these
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Methanogens link ATP synthesis to methanogenesis by ________.
A. substrate-level phosphorylation B. the reverse TCA cycle C. electron transport to generate proton motive force D. the use of bacteriorhodopsin
Where does heart excitation originate?
a. atrioventricular node b. intercalated disk c. sinoatrial node d. pericardium e. all cardiac muscle fibers simultaneously
During which phase of mitosis are the replicated chromosome aligned in the middle of the cell?
A) prophase B) anaphase C) metaphase D) telophase
Which of the following is NOT a main function of B lymphocytes?
A) To produce an antibody B) To present pathogens C) To digest pathogens D) To activate T-lymphocytes E) To produce interleukins