Because of the high requirement for reducing power in nitrogen fixation, the nitrogenase enzyme that carries out the reaction is very sensitive to the presence of ________.
A. oxygen
B. light
C. carbon dioxide
D. None of the choices are correct.
Answer: A
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At rest, neurons exhibit a negative membrane potential. Among the factors that maintain this polarity, assess which is most DIRECTLY responsible for the difference between intracellular and extracellular ion concentrations?
A. movements of negatively charged proteins and nucleic acids across the membrane. B. passive leakage of Na+ ions across the membrane. C. passive leakage of K+ ions across the membrane. D. movement of Na+ ions through voltage-gated Na+ channels. E. movement of K+ ions through voltage-gated K+ channels.
What are the functions of the mammalian kidney? Check all that apply.
_____ water retention _____ filtration of blood _____ excretion of nitrogenous waste _____ regulation of salt balance in the blood _____ production of urea
The two main divisions of the skeletal system are:
A) cranial and axial. B) vertebral and appendicular. C) appendicular and cranial. D) appendicular and axial. E) axial and articular.
Does the data on butterfly larval survival (shown below) by itself conclusively show that imperial blue but-terflies and Iridomyrmex ants engage in an overall mutualistic and not an antagonistic relationship?
a. Yes, the decreased mortality in the presence of ants provides a tremendous fitness gain for the ants. b. Yes, larvae need to survive in order to reproduce. c. No, the decrease in survival can be easily compensated by the high reproductive rate of the cat-erpillars. d. No, the gain in fitness through increased survival may be offset by a decrease in reproduction due to the secretion provided to the ants.