One difference between cardiac muscle fibers and skeletal muscle fibers is that cardiac muscle fibers:a
have several nuclei, while skeletal muscle fibers do not.
b. are not striated, while skeletal muscle fibers are.
c. are under voluntary control, while skeletal muscle fibers are not.
d. branch and form complex networks, while skeletal muscle fibers do not.
e. are cylindrical-shaped, while skeletal muscle fibers are spindle-shaped.
D
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It is believed that the coelacanths and lungfish represent a crucial link between other fishes and tetrapods. What is the major feature in these fish in support of this hypothesis?
A) Like amphibians, they are tied to the water for reproduction. B) Their fins have skeletal and muscular structures similar to amphibian limbs. C) They have highly evolved nervous and circulatory systems. D) They have lungs and are able to breathe air when water is scarce. E) They enter a hibernative stage when food is scarce, as many tetrapods do.
Pyruvate can be used to produce (select all correct choices):
A. sugars. B. acetyl-CoA. C. alanine.
What is the total magnification of a chloroplast viewed with a 10x ocular lens and a 45x objective lens?
a. 4.5x b. 10x c. 45x d. 100x e. 450x
Which of the following interactions is the molecular basis of muscle contraction?
A. Myosin and thick filaments. B. Sarcomeres and T tubules. C. Myosin and thin filaments. D. Troponin and tropomyosin