When sodium ions move from one cardiac muscle cell to an adjacent cell, causing them to contract in unison, this is an example of ____.
A. autocrine signaling
B. paracrine signaling
C. contact-dependent signaling
D. endocrine signaling
E. direct intercellular signaling
E. direct intercellular signaling
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Proteins are diverse molecules that perform a wide variety of functions. Which of the following is not a typical function of proteins?
A. Transport B. Movement C. Catalyze reactions via enzymes D. Energy storage
This animal has a coelom, a closed circulatory
system, and a clitellum. This animal is ___.
a. an earthworm b. a leech c. a roundworm d. a planarian e. more than one of these
All known species belong to one of three domains. What are these domains?
a. Prokarya, Bacteria, and Eukarya b. Prokarya, Archaea, and Eukarya c. Plantae, Bacteria, and Animalia d. Bacteria, Archaea, and Eukarya e. Bacteria, Archaea, and Protista
The ____ system is responsible for filtering wastes from the blood
a. respiratory b. urinary c. digestive d. endocrine e. circulatory