Plaque is _____ caused by _____
a. an infectious disease; bacterial biofilms d. a non-infectious disease; E. coli
b. a non-infectious disease; inflammation of
the gums
e. an infectious disease; E. coli
c. an infectious disease; non-pathogenic
bacteria
A
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A chemical that binds to a cell to cause its activity to change is an example of which of the following elements of cellular communication?
A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices are correct.
As animals develop from embryos to adults, the relative sizes of body organs remain constant
Indicate whether the statement is true or false.
Bryophytes differ from all other land plants in
that they
a. possess swimming sperm. b. have stomata. c. have dependent sporophytes. d. exhibit alternation of generations. e. protect the embryo inside parental tissue
Which of the following statements is (are) true
concerning promoters? a. They are short sequences in DNA. b. They are locations in DNA where regulatory proteins gather. c. They control transcription. d. They are associated with specific genes. e. All of these are true.