In the myofibril the thin filament is organized around a rod-like core protein called
A) titin.
B) actin.
C) G actin.
D) nebulin.
E) myosin.
D
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A T4 assay is used to
A) determine the number of calories in food. B) directly measure the basal metabolic rate. C) obtain an index of metabolic activity. D) monitor the energy efficiency of metabolism. E) determine the amount of oxygen consumed during metabolism.
The optimal pH for pepsin activity is _______.
A) 9 B) 7 C) 2 D) The activity was the same at a pH of 2, 7 and 9.
The loop of Henle is categorized into distinct segments including all of the following EXCEPT:
A. a thin segment of the descending limb of the loop of Henle B. a thin segment of the ascending limb of the loop of Henle C. a thick segment of the descending limb of the loop of Henle D. a thick segment of the ascending limb of the loop of Henle
Secretion of the parathyroid hormone is regulated by blood levels of:
A) sodium. B) calcium. C) potassium. D) phosphorus.