________ is the scientific study of the relationship between organisms and their environment
Fill in the blank(s) with correct word
Ecology
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The most common cause of epidemic waterborne diarrheal disease is ________.
A. Naegleria B. Acanthamoeba C. Giardia intestinalis D. All of the choices are correct.
EcoRI and HindIII are ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
Muscle cells are not typical cells because
a. groups of them fuse in the embryo to form multinucleated fibers. b. they contain actin proteins. c. they contain myosin proteins. d. they respond to stimuli. e. all of these are true
The immune system consists of two components: ________ and ________.
A) leukocytes : lymphoid tissues B) plasma cells : cytotoxic T cells C) lymphocytes : phagocytes D) leukocytes : lymphocytes E) antigens : antibodies