dioxin is a chemical byproduct made during manufacturing. animal testing has shown that it can have negative effects on organisms such as birth defects, liver damage, and immune suppression. however, the effects vary greatly between species. a mouse may be able to handle a higher dose than a cat. dioxin enters a cell and binds to a receptor protein, which then attaches to the cell's genetic material. how does dioxin's mechanism contribute to its variable effects on different organisms?
a. organisms that do not require receptor proteins to initiate genetic expression are not affected by dioxin.
b. dioxin may bind to receptor proteins that inhibit expression in some genes and promote expression in others.
c. dioxin only binds to receptor proteins that affect particular genes in particular species.
d. genes that are inhibited by receptor proteins are not affected by dioxin since they are not expressed anyway.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

your answer is going to be physical weathering