The functional unit of a skeletal muscle fiber is the
A) Sarcolemma.
B) Sarcomere.
C) Sarcoplasmic reticulum.
D) Myofibril.
E) Myofilament
B) Sarcomere.
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Indicate whether the statement is true or false
Which of these is responsible for the flexibility of bone?
A. collagen B. canaliculi C. calcium salts D. cartilage
Imagine that you discovered an enzyme in the human stomach that turned the substrate "ABC" into the product "XYZ". Name this enzyme (using the standard convention) and describe its chemical characteristics. Under what conditions would it be an effective catalyst? How might its activity be regulated?
What will be an ideal response?
Since fibrinogen is always present in the blood but the blood does not clot, ____ must normally be absent
a. prothrombin b. thrombin c. calcium d. red blood cells e. platelets