Oxygen crosses a plasma membrane
a) by osmosis.
b) through porins.
c) with the of a nonspecific transporter.
d) through simple diffusion.
e) through facilitated diffusion.

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

Amylase becomes denatured at a temperature of 80°c. during an experiment to study the effect of varyingtemperature on enzyme activity, amylase’s reactivity with starch was measured at body temperature (37°c), andthen again at an increased temperature of 42°c. how would this increase in temperature affect the experiment

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above