DNA is localized mainly in the
A) cell membrane.
B) endoplasmic reticulum.
C) vacuoles.
D) chromosomes.
E) Golgi.
D) chromosomes.
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Proto-oncogenes (select all correct choices):
A. are mutated constituents of cell division signaling proteins that are hyperactive. B. can be mutated by cigarette smoke to become triggers for cancer. C. can be abnormal growth factors, cell surface receptors, or members of a signal transduction pathway. D. promote cell division.
Enzyme molecules require a specific shape to perform their catalytic function. Which of the following might alter the shape of an enzymatic protein?
A. denaturing the protein B. a change in salt concentrations or pH C. heating the protein D. mixing in a chemical that removes hydrogen bonds E. all of the above
Gums bleeding while brushing one's teeth is most commonly associated with
A) halitosis. B) cavities. C) gingivitis. D) periodontitis. E) trench mouth.
Horses and tapirs have a common ancestor, but now look very different. Horses now are grassland animals adapted for grazing on grass and shrubs. Tapirs are jungle animals that live in dense forests and eat fruit, leaves, and aquatic vegetation. Which of the following led to the development of such differences in the two species?
A. selective breeding B. convergent evolution C. DNA hybridization D. natural selection