Bacteria in biofilms or abscesses may be replicating very slowly and are therefore resistant to chemotherapy because many agents affect pathogens only if they are actively growing and dividing.
Answer the following statement true (T) or false (F)
True
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A plasmid vector and chromosomal DNA are treated separately with the same restriction enzyme. Which of the following might occur if the digested plasmid and chromosomal DNA were incubated together?
A. The two sticky ends of the plasmid could hybridize back together, recircularizing. B. The two sticky ends of the plasmid could hybridize to both sticky ends of the chromosomal DNA fragments. C. The two sticky ends of the plasmid could hybridize back together and recircularize as well as hybridize to both ends of a fragment of chromosomal DNA. D. The two sticky ends of the plasmid could hybridize with two ends of another type of plasmid. E. The two sticky ends of the vector would remain free or unhybridized.
The transduction of sound waves into electrical signals takes place
A. within the tectorial membrane as it is stimulated by the hair cell. B. within hair cells as they are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons. C. as the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in a sensory neuron. D. as the basilar membrane vibrates at different frequencies in response to the varying volume of sounds. E. within the middle ear as the vibrations are amplified by the malleus, incus and stapes.
The arrows in the diagram below are pointing to the ____
a. esophagus and small intestine b. trachea and large intestine c. sphincters at the top and bottom of the stomach d. esophagus and pancreas e. stomach
Heart Block is one type of electrical defect in the heart in which the electrical signal from the sinoatrial node to the relay point is delayed. Predict the effect of Heart Block on the cardiac cycle
A) The atria relax for a shorter period of time. B) The atria relax for a longer period of time. C) The ventricles relax for a shorter period of time. D) The ventricles relax for a longer period of time.