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.

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Which of the following are jawless fishes?

A. lampreys B. sharks C. tuna D. salmon E. skates

Biology & Microbiology

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.

Biology & Microbiology