The first event in photosynthesis is the:
a. movement of hydrogen ions through ATP synthases
b. donation of electrons from a photosystem to an electron transfer chain
c. fixation of carbon dioxide
d. breakdown of the thylakoid membrane
e. formation of phosphoglyceraldehyde
b
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Which of the following is least likely to be involved in a cell localization regulatory mechanism?
A. steroid hormone receptors B. ubiquitination of proteins C. dephosphorylation of proteins D. sumoylation of proteins
This portion of the graph shows the activation energy when there is an enzyme
a. A b. B c. C d. W + X e. Y + Z
The region(s) where a countercurrent mechanism
operates is (are) indicated by a. A. b. B. c. C. d. D. e. C and D.
What factor(s) can create positive feedback, making shock following hemorrhage get worse instead of better? Choose all that apply.
A. Low blood pressure causes baroreceptors to have a lower firing rate, secreting more norepinephrine and less acetylcholine, increasing cardiac output and causing vasoconstriction. B. Inflammation leads to vasodilation, lowering blood pressure. C. Dying organs cannot function to help restore blood pressure. D. Stress raises blood pressure. E. Dying cells release inflammatory factors.