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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The ____ system is responsible for filtering wastes from the blood

a. respiratory b. urinary c. digestive d. endocrine e. circulatory

Biology & Microbiology