Organisms called ________ live on or in the body of a host and cause some degree of harm.
A. pathogens
B. mesophiles
C. commensals
D. halophiles
E. aerobes
Answer: A
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Adjacent nucleotides on a strand of DNA are connected to each other by a(n) ____
a. hydrophobic interaction b. phosphodiester bond c. hydrogen bond d. peptide bond e. ionic bond
Biochemically, a gene is BEST defined as a
a. unit of heredity. b. part of a chromosome. c. region of DNA that codes for protein assembly. d. portion of the nuclear chromatin. e. part of the material located in the nucleus.
This class of antibodies is first to appear after infection, activates complement, and causes cells to clump, encouraging phagocytosis.
A. IgG B. IgM C. IgE D. IgD
Organs are composed of tissues, which are composed of cells. This is an example of which characteristic of life?
(a). Living things grow and develop. (b). Living things respond to stimuli. (c). Living things maintain themselves by homeostasis. (d). Living things have levels of hierarchical organization. (e). Living things are adapted to the environment.