Answer Happy

1) How do the active sites of enzymes contribute to the
catalysis of a chemical reaction?
a Active sites strain the chemical bonds of substrates, which
increases the activation energy of a reaction.
b Active sites bring substrates together, releasing energy which
permanently alters the enzyme's active site.
c Active sites bring substrates together, and may also strain
the chemical bonds of the substrates, both helping a reaction to
proceed more quickly by decreasing the activation energy.
d Active sites decrease the activation energy of a reaction by
adding protein inhibitors to a substrate.
2)Edema may result from
a decreased blood hydrostatic pressure.
b hindering the flow of water out of the capillaries.
c lymphatic blockage.
d hyperproteinemia.
3)What causes hemoglobin to release oxygen to body tissues?
a increased tissue pH due to carbon dioxide production
b decreased tissue pH due to carbon dioxide production
c decreased tissue oxygen due to cellular respiration
d increased nitric oxide due to vasodilation
4) Hormones often cause a cell to elicit multiple responses;
this is because
a the receptors bind to several hormones at the same time.
b the protein kinases are rapidly metabolized.
c there are thousands of receptors on the cell membrane.
d second messengers stimulate groups of enzymes.