Calcium ions are involved in muscle contraction by 

A. manufacturing ATP.
B. causing the muscle cell to depolarize.
C. binding to the troponin-tropomyosin complex and exposing actin.
D. repairing the damage done during contraction.


C. binding to the troponin-tropomyosin complex and exposing actin.

Biology & Microbiology

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Which of the following is not one of the distinctive features of dinoflagellates? 

A. They are unicellular. B. They are photosynthetic. C. Some exist in fresh water, while some are part of marine plankton. D. They form large, spherical colonies. E. Some planktonic members are luminous and cause flashes in the night.

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Seed plants are _____

a. flowering plants d. spermatophytes b. conifers e. tracheophytes c. gymnosperms

Biology & Microbiology

Specialized islet cells that secrete hormones are found scattered throughout the:

a. adrenal cortex b. liver c. thymus d. adrenal medulla e. pancreas

Biology & Microbiology

Proteins are composed of strings of nucleotides connected by 5'-3' phosphodiester bonds

Indicate whether the statement is true or false

Biology & Microbiology