Explain the difference between an absolute and a relative refractory period. What will be an ideal response?
Concepts to Consider: Absolute refractory period--during the time in which an axon membrane is
depolarized, it cannot relay another neural impulse no matter how strong of a stimulus is applied.
Voltage-gated sodium channels are inactivated. Relative refractory period--time when sodium
channels have been reset. Axon can transmit impulses, but the threshold level is higher
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Which of the following is a type of RNA?
a. mRNA b. fRNA c. sRNA d. dRNA
Pressure increases one atmosphere every ________ meters in the ocean
a. 100 b. 10 c. 30 d. 3
What are opsins and what are they a part of?
a. membrane lipids that form a complex with a retinal molecule at the centre b. membrane proteins that form a complex with a retinal molecule at the centre c. retinal molecules that form a complex with membrane proteins at the centre d. retinal molecules that form a complex with membrane lipids at the centre
Mycoplasma pneumoniae causes respiratory disease by
A) infecting and killing alveolar macrophages. B) triggering inflammatory mediator release. C) attaching to and ultimately killing the ciliated epithelial cells of the trachea. D) paralyzing the respiratory muscles. E) killing the epithelial cells of the alveoli.