Finding a specific clone in a library does NOT require
A. probes.
B. restriction enzymes.
C. radioactive or fluorescent compounds.
D. nutrient plates.
E. DNA binding filters.
B
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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
The size of a muscle can be increased by ____
a. increased muscle cell division b. addition of muscle companion cells c. addition of muscle companion cells d. synthesis of new protein filaments e. overproduction of myostatin
Which of the following statements about keratin is false?
a. It is a protein molecule. b. It is manufactured by epidermal cells. c. It gives strength to the skin. d. It acts as an evaporative barrier to prevent excess water loss. e. It facilitates diffusion across the body surface.
A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a
A. nucleolus. B. nucleus. C. cell. D. plasma membrane.