All chemical reactions are theoretically reversible. Comment on this statement
What will be an ideal response
It is possible to reverse any reaction if the products are still present. Those that are only slightly exergonic are easily reversible. Some would require an enormous amount of energy to reverse. In the simple reaction Na + Cl ? NaCl the amount of energy it takes to reverse table salt to chlorine gas and sodium metal is enormous. When glucose is oxidized the energy goes into bonds of ATP molecules which are then spent and thus the energy is not available to reform glucose.
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Nonsteroid hormones have hormone receptors in the:
a. nucleus of the cell b. cytoplasm of the cell c. cell membrane d. both A and C above
During the execution of a pull-up when the chin is over the bar, which force exerted by the biceps brachii is greatest at the elbow?
A. the rotary force B. the stabilizing force C. the dislocating force D. the "pinching" force
What is the rate-limiting (regulated) step for stimulating the secretion of aldosterone?
A. conversion of angiotensin I to angiotensin II in the blood B. secretion of angiotensinogen by the liver C. conversion of angiotensinogen to angiotensin I in the blood D. secretion of ACTH by the anterior pituitary E. secretion of angiotensin II by the kidney
What is a local potential?
A. The flow of electricity begun by stimulating the cell body of a neuron B. The flow of electricity begun by stimulating the dendrite of a neuron C. The flow of electricity begun by stimulating the axon of a neuron D. None of these answers are correct