Myofibril contractile subunits, the sarcomeres, are bounded on each end by a disc of protein called the
A. A band.
B. M line.
C. H band.
D. I band.
E. Z line.
E. Z line.
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Select the mismatched pair of Phylum Mollusca classes and their examples.
A. Polyplacophora—chitons B. Gastropoda—slugs C. Bivalvia—snails D. Cephalopoda—nautilus E. Gastropoda—nudibranchs
In this figure, which of the following are composed primarily of proteins?
a. A and B b. B and C c. B and D d. A and D
Which of the following are jawless fishes?
A. lampreys B. sharks C. tuna D. salmon E. skates
Spongiform encephalopathies are
A. associated with abnormal, transmissible, protein in the brain. B. caused by prions. C. chronic, fatal infections of the nervous system. D. Creutzfeldt-Jacob disease, kuru, and Gertsmann-Straussler-Scheinker syndrome. E. All of the choices are correct.