At rest, active sites on the actin are blocked by
A) myosin molecules.
B) troponin molecules.
C) tropomyosin molecules.
D) calcium ions.
E) ATP molecules.
C
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Answer the following questions true (T) or false (F)
1. Polypeptide chains that contribute to a protein's quaternary structure each have their own primary, secondary, and tertiary structures. 2. Energy is released when ATP is broken down into ADP. 3. Bone provides the site of attachment for most smooth muscles.
Most oxygen is carried in the blood ______; but most carbon dioxide is ________
A. dissolved in plasma; associated with salt or acid B. bound to hemoglobin; associated with bicarbonate ions in the plasma C. combined with albumin; associated with carbonic acid D. bound to hemoglobin; bound to albumin E. bound to plasma proteins; carried as carbon dioxide
The vitamin that prevents breakdown of vitamin A and fatty acids is vitamin
A) A. B) B. C) C. D) D. E) E.
In the diagram of the ulna and radius, where is the styloid process of the radius?
a) A b) B c) E d) F e) None of these choices are correct.