Nitrogen fixation depends on the enzyme nitrogenase, which is produced by some ________.
A. eukaryotes
B. bacteria
C. fungi and bacteria
D. bacteria and Archaea but no eukaryotes
E. Archaea
Answer: D
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All of the following are actin-dependent nonmuscle motilities except
A) extension of the ER. B) cleavage furrow constriction in cytokinesis. C) chemotaxis. D) cyclosis or cytoplasmic streaming. E) amoeboid movement.
Which one of the following is typically removed from the blood by the tubular secretion process?
A) drugs such as marijuana and cocaine B) urea C) protein D) red blood cells E) water
Look at the cross section of a cell membrane of a eukaryotic cell. H+ ions are being pumped from a low concentration to a high concentration. Which of the following best describes the type of transport across the cell membrane?
A. active transport B. passive transport C. facilitated diffusion D. co-transport
Which of the following parts of the Golgi complex receives materials from the ER?
A. Cisternal edges B. Cis face C. Trans face D. None of the choices are correct.