What is the role of calcium in muscle contraction?
A. It stimulates the passage of an electrical signal along the length of the sarcolemma.
B. It binds to tropomyosin to expose a binding site for thick filaments.
C. It provides energy for contraction.
D. It binds to troponin to expose a myosin binding site.
E. It binds to troponin to expose an actin binding site.
D. It binds to troponin to expose a myosin binding site.
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The male and female skeletons differ in which way?
A. Females have a wider pelvis. B. Males have a wider pelvis. C. Females have fewer rib bones. D. Males have more rib bones.
The most numerous white blood cells are ________.
Fill in the blank(s) with the appropriate word(s).
Elephantiasis is caused by ________.
A. high arterial blood pressure B. myxedema C. decreased plasma protein concentration D. obstruction of lymphatic drainage
When the ribosome reaches a stop codon, its A site binds a protein called a release factor instead of a tRNA. the release factor causes the finished protein to break away from the ribosome. which step of translation does this describe?
a) elongation b) transcription c) termination d) initiation