In a neuron, a graded potential:a
does not vary in magnitude.
b. becomes stronger as it propagates.
c. only generates slow action potentials.
d. fades out within a few millimeters.
e. propagates only along unmyelinated axons.
d
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What is NOT a reason why an abscessed wound might not respond to antibiotic treatment?
A. The bacteria within the abscess have ceased replicating, and many antibiotics require actively replicating cells in order to be effective. B. The blood vessels that would bring the drug to the area have been destroyed or clogged with clots, preventing the drug from getting to the microbes in the abscess. C. The bacteria in an abscess have all acquired multi-drug antibiotic resistance, so any drugs that are used will have no effect. D. The chemical composition of the pus in the abscess often inactivates antibiotic drugs, making them ineffective.
How is the process of adding the correct amino acid onto a tRNA molecule catalyzed?
a. by RNA polymerase b. by the tRNA itself c. by an aminoacyl-tRNA synthetase
Pasteur used swan-neck flasks in his experiments to prove that
A. dust in air was a source of living microorganisms. B. microorganisms could cause disease. C. microorganisms could be grown in laboratory infusions. D. air had "vital forces" capable of spontaneous generation. E. microbial fermentation could be used to make wine.
During your annual physical, a nurse takes your blood pressure by wrapping a sphygmomanometer cuff around your upper arm, which modulates the flow of blood through your brachial artery. The nurse then enters a reading of 115/70 in your medical chart. These numbers mean that the
A. pressure in your brachial artery during ventricular contraction is 115, while the pressure during ventricular relaxation is 70. B. nurse heard sounds through the stethoscope only when the pressure in your brachial artery was exactly 115 and again when it was exactly 70. C. diastolic pressure is 115 and the systolic pressure is 70. D. pressure in the ventricles of the heart is 115 when the ventricles are contracting and 70 when the ventricles are relaxing. E. pressure in your brachial artery during ventricular contraction is 115 while the pressure during atrial contraction is 70.