Cancer is best defined as
A) immune dysfunction.
B) uncontrolled and abnormal cell division.
C) viral malignancy.
D) regulated differentiation of tissue.
E) cellular deregulation.
B
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Bacteria contain plasmids because
A. they are essential for growth. B. they provide genes that allow the bacteria to grow and thrive in the presence of potential toxins. C. they are essential for cellular respiration. D. humans artificially created plasmids and then inserted them into bacteria. E. they are essential for chromosome replication and binary fission.
In which of the following ways does cardiac muscle differ from skeletal muscle?
A. Cardiac muscle is striated and skeletal muscle is not. B. Cardiac muscle surrounds hollow tubes; skeletal muscle attaches to skin. C. Cardiac muscle cells are electrically connected; skeletal muscle cells are not. D. Cardiac muscle is under voluntary control; skeletal muscle is under involuntary control. E. A group of cardiac muscle cells forms an organ; a group of skeletal muscle cells forms a tissue.
The majority of the heat that is transferred from the earth to the atmosphere is transferred by:
a. radiation of heat into the atmosphere. b. evaporation of water. c. absorption by the lithosphere. d. reflection of heat into space.
Diffusion is the movement of atoms or molecules from regions of high concentration to regions of low concentration
a. True b. False