Cancer is a disease caused by mutations. Yet in most instances if one of your parents tragically died from cancer, this does not put you at greater risk than a person whose parents do not develop cancer. How can cancer be caused by mutations and yet not
be heritable?
A) Most cancers arise from mutations in germ-line cells.
B) Cancer-causing mutations are repaired in offspring but not in parents.
C) Most cancers arise from mutations in somatic cells.
D) The mutations that cause cancer are special and cannot be passed on regardless of what type of cell they occur in.
Answer: C
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Which of the following is/are true about natural selection?
A. It assures the survival of every fit individual. B. It acts on genotypes rather than phenotypes. C. It always selects for more complex forms. D. On average, it favors the survival of individuals that have adaptive characteristics. E. All of the answer choices are correct.
Which of the following statements regarding phosgene is correct?
A) Phosgene is a product of combustion and may be encountered at a fire involving a textile factory or the burning of freon. B) Initial signs and symptoms of phosgene exposure include abdominal pain, hematemesis, exertional dyspnea, and a cough. C) Phosgene is a rapidly acting chemical that produces immediate airway irritation, nausea, a severe cough, and profound pulmonary edema. D) Because phosgene is an odorless chemical, the patient may remain in the contaminated area for an extended period of time.
Select the correct statement about the energy and/or nutrient that makes life possible.
A) both are recycled, nutrients when an organism dies and energy when it is eaten B) the sun provides energy in the form of heat C) producers obtain both energy and nutrients from the environment while consumers obtain both by using the tissues of producers or other organisms D) nutrients move through the ecosystem in a continuous directional flow E) all of the choices
Plants sensing chemicals in the environment is/are important to:
A. help find food B. sense invasion by pathogens C. sense herbivory D. all of the above are important mechanisms for chemical reception