Disadvantages of continuous cell cultures include
A) they only grow for a limited number of generations.
B) the expense of preparation.
C) they may be significantly different genetically from the original source animal.
D) viruses do not reliably infect them.
E) they are both expense and have a limited number of division.
C
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Which of the following is the homeostatic
control for respiration?
a. carbon dioxide concentrations b. oxygen concentrations c. ATP concentrations d. activity rates e. more than one of these is the homeostatic control for respiration
The amphibians are believed to have arisen from ancestral:a
chondrichthyean fishes. b. actinopterygian fishes. c. reptiles. d. sacropterygian fishes. e. amphibians.
Which of these conditions would not affect the ability of Streptococcus mutans to attach to teeth?
A) the absence of Actinomyces, a bacterium that can be part of dental plaque B) the lack of sucrose C) the lack of the enzyme glucosyltransferase D) the inability to form dextran E) the lack of a glycocalyx
Organelles are:
A) organisms. B) like tiny organs within cells. C) a group of cells that serve a common function. D) cells. E) proteins.