The contractile unit of a skeletal muscle fiber
is a(an) ___.
a. myofibril
b. sarcomere
c. myosin filament
d. actin filament
e. Z line
B
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Indicate whether the statement is true or false.
Duchenne muscular dystrophy and Becker's muscular dystrophy are caused by different mutations in the same X-linked gene
a. True b. False Indicate whether the statement is true or false
Which of the following are adaptations of fluid feeders that feed on the blood of other
animals?
a. piercing and sucking mouthparts b. production of anesthetic compounds c. production of anticoagulants d. all of these
The two strands of a DNA double helix are said to be antiparallel. This means that ____
a. the 5' end of one strand is directly paired with the 5' end of the other strand b. since the double helix twists, it is not perfectly parallel c. one strand has a negative charge and the other strand has a positive charge
d. the 5' end of one strand is directly paired with the 3' end of the other strand e. both strands have a negative charge