The process of acquiring antibiotic resistance by means of bacteriophage activity is called
a. transduction.
b. R-plasmid acquisition.
c. point mutation.
d. transformation.
Answer: a. transduction.
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Positive feedback systems play a role in ____
a. blood pressure control b. fluid volume regulation c. body temperature regulation d. child birth e. blood glucose regulation
Which of these structures is located under the cerebral hemispheres and is important in sensory experience, motor activity, stimulation of the cerebral cortex, and memory?
A) hypothalamus B) thalamus C) pons D) cerebellum
During a study session about evolution, one of your fellow students remarks, "The giraffe stretched its neck while reaching for higher leaves; its offspring inherited longer necks as a result
" Which statement is most likely to be helpful in correcting this student's misconception? A) Characteristics acquired during an organism's life are generally not passed on through genes. B) Spontaneous mutations can result in the appearance of new traits. C) Only favorable adaptations have survival value. D) Disuse of an organ may lead to its eventual disappearance.
When blood supplies oxygen and food to a cell surface and these molecules diffuse across, we might expect some "resting time." However, if we inspected most cell membranes in a living human body, we would find a nearly continuous flow of substances back-and-forth across the plasma membrane. Which of the following is NOT a reason why?
A) Cell metabolism is constantly using up oxygen and raw materials; this lowers their concentration so more will diffuse into the cell. B) Cell metabolism is constantly producing waste molecules; this increases their concentration so more will diffuse out of the cell. C) Cells produce useful secretions; this increases their concentration and more will diffuse out of the cell. D) Cell metabolism constantly produces carbon dioxide in respiration; this increases its concentration so more will diffuse out of the cell. E) Cells are living entities and in order to live can never "rest".