Depolarization of a membrane is achieved through what process?
a. sodium exiting the membrane via sodium channels
b. potassium exiting the membrane via potassium channels
c. the influx of sodium via the opening of sodium channels
d. the work of the sodium-potassium pump
c. the influx of sodium via the opening of sodium channels
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Which spores are NOT involved in sexual reproduction of fungi?
A) ascospores B) basidiospores C) conidia spores D) zygospores
Plants open their stomata to obtain
a. carbon dioxide from air. b. oxygen from air. c. sugar from the roots. d. water from air
Of the following organs, which is NOT in the
abdominal cavity? a. stomach b. liver c. heart d. intestine e. pancreas
The image below diagrams the action of an enzyme. Notice that the enzyme is depicted as being more tightly wrapped around the substrates in step 2 than it is in step 1. Why is this?
a. When a substrate locks into the active site of an enzyme, the enzyme changes shape to mold itself around the substrates. b. Generally, the size of a substrate is larger than the size of the active site into which it must fit. When the substrate enters the active site, the active site must stretch to fit. c. Before catalysis can occur, a substrate must change its shape so that it fits into the active site of the enzyme more precisely. d. Most active sites are only designed to hold one substrate. In this image, two substrates enter the active site, creating a tighter fit.