The five steps listed below are part of the cross-bridge cycle
1. The myosin head binds to actin.
2. The myosin head is cocked back through the hydrolysis of ATP.
3. The actin filament slides relative to the myosin filament.
4. The myosin head binds ATP.
5. The myosin head detaches from the actin.
Which of the following lists the steps in the correct order?
A. 4, 5, 2, 1, 3
B. 1, 4, 2, 3, 5
C. 1, 2, 3, 4, 5
D. 5, 4, 1, 2, 3
E. 2, 1, 3, 5, 4
A
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A. liver B. pituitary C. thalamus D. kidney E. pancreas
What would be the most direct result of an individual having an inability to produce surfactant in their alveoli?
A. The alveoli would be much more likely to harbor infections. B. Oxygen exchange with the blood would be impaired due to a thickening of the epithelium. C. The alveoli would fill with fluid due to an ion transport defect. D. Carbon dioxide exchange with the blood would be impaired due to an inhibition of carbonic anhydrase. E. The alveoli would physically collapse.
What is significant about cephalization?
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Since Rubisco can either fix carbon or oxidize RuBP, what condition will be most favorable for glucose production?
A. high oxygen environment B. dry climate C. moderate temperatures D. high temperatures