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) Tropomyosin molecules.
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Disuse of the joints ____________ which hastens stiffening
A) degenerates cartilage B) causes injuries C) hampers blood flow D) causes arthritis
In addition to temperature control, blood flowing to the skin supplies a source of ____________________
Fill in the blank(s) with correct word
Around day 21 of development the primitive heart begins to beat. At this stage it contains the four chambers: two atria and two ventricles.
Answer the following statement true (T) or false (F)
Which of the following types of membrane proteins function by recognizing and binding to hormones and neurotransmitters?
a) transporters b) receptors c) enzymes d) linkers e) cell identification markers