Luz, a woman with a history of asthma, walked by a house and noticed that smoke was pouring out of the basement. Evidently, any smoke detector was either absent or not working because nobody in the home was reacting to the emergency
Luz banged on the front door and threw it open, screaming that there was a fire. The family immediately rushed out, but upon reaching the safety of the front lawn, one of the children said the cat was trapped inside. Luz dashed into the now smoke-filled structure, searched around, found the cat, and emerged with the frightened but safe creature. According to the chapter, what short- and long-term problems will Luz most likely have?
She is very likely to have an acute asthma attack soon, but in the long term she may experience a decline in her expiratory reserve volume.
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Which one of the following is the function of horizontal cells in the eye?
A. They transmit signals from rods and cones to the optic nerve. B. They receive signals from multiple photoreceptors (rods and cones), integrating and regulating their input. C. They communicate between and among bipolar cells. D. They process of visual input to actually form an image.
Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor?
A. The repressor binds directly to the RNA polymerase to block the closed-to-open transition at initiation. B. The repressor induces a conformational change in the polymerase that accelerates the closed-to-open transition. C. The binding of the repressor sterically occludes binding of the RNA polymerase to the promoter. D. The repressor binds directly to the DNA to stabilize the closed complex over the open complex.
During the eugenics movement of the 1900s, it was believed that individuals affected with certain genetic disorders should be sterilized to prevent transmitting the gene to future generations. Would such measures be effective? Why or why not?
What will be an ideal response?
During an action potential, the membrane potential can reach as high as ____
a. -10 mV b. 0 mV c. +10 mV d. +20 mV e. +30 mV