Which of the following is not a mechanism for turning off a neurotransmitter? a) using the neurotransmitter to clog the postsynaptic channels                       b) uptake of the neurotransmitter into the presynaptic cell   c) movement of the neurotransmitter out of the synaptic cleft         d) use of enzymes to alter the neurotransmitter

Spherocytosis is an inherited blood disease in which the erythrocytes (red blood cells) are spherical instead of biconcave. this condition is inherited in a dominant fashion, with sph- dominant to sph+. in people with spherocytosis, the spleen "reads" the spherical red blood cells as defective, and it removes them from the bloodstream, leading to anemia. the spleen in different people removes the spherical erythrocytes with different efficiencies. some people with spherical erythrocytes suffer severe anemia and some mild anemia, yet others have spleens that function so poorly there are no symptoms of anemia at all. when 2400 people with the genotype sph- sph+ were examined, it was found that 2250 had anemia of varying severity, but 150 had no symptoms. does this description of people with spherocytosis represent incomplete penetrance, variable expressivity, or both? explain your answer. (3 points)

Joe has been suffering from asthma since childhood. recently, a severe asthma attack struck, after which he has been finding it difficult to breathe normally. what can ease his condition?

To avoid food poisoning, perishable items should not be stored in the refrigerator for more than days.