Nitrogenase and Oxygen
What will be an ideal response?
•Nitrogenase is highly sensitive to oxygen.
•O2 from photosynthesis needed to generate ATP for fixation
-N-fixation is often coupled with photosynthesis
•Most N-fixers live in well oxygenated environments and respire aerobically.
-A range of different strategies have evolved to protect nitrogenase.
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In Belding's ground squirrels, it is mostly the females that behave altruistically by sounding alarm calls. What is the likely reason for this distinction?
A) Males have smaller vocal cords and are less likely to make sounds. B) Females invest more in foraging and food stores, so they are more defensive. C) Females settle in the area in which they were born, so the alarm is more likely to warn kin. D) The sex ratio is biased. E) Males forage in areas separate from females; therefore, alarm calls are useless.
If ATP synthase had a mutation in the F1 complex portion of the protein, which function of ATP synthase would most likely be affected?
A. The rotation of the rotor B. The flow of protons through the channel C. The conversion of ADP and Pi to ATP D. The insertion of the enzyme into the membrane Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about ATP synthase structure and function? What other information is related to the question? Choose Answer Do you have all necessary information to determine which outcome is most likely from a mutation in the F1 part of ATP synthase? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. Photosystem I B. Photosystem II C. Photosystem III D. Photosystem I and II E. Photosystem I, II and III
A gene that has three or more alleles is called a ____
a. pleiotropic gene b. dominant gene c. multiple allele system d. trivalent gene e. polyvalent gene