25. In many second messenger mechanis calcium binds to____________ and together

Question

25. In many second messenger mechanis calcium binds to____________ and together they form a complex which activates carious enzyme system

a. adenylyl cyclase b. G proteins c. calmodulin d. IP3 e. all of the above

47. By osmosis, water always moves to an area of higher

a. electrical intensity b. fluid pressure c. mitochondrial activity d. solute concentration e. water concentration

48. steroids

a. are lipophilic b. are derived from cholesterol c. initiate the synthesis of specific new proteins within their target cells d. both a and b are correct e. all are corrrect

50. glycolysis

a. requires oxygen

b. yeilds a net of two molecules of ATP for each molecule of glucose processed

c. takes place in the mitochondrial matrix

d. both a and b are correct

e. all are correct

Explanation / Answer

Solution:

25. In many second messenger mechanism calcium binds to a calmodulin and together they form a complex which activates carious enzyme system.

47. By osmosis, water always moves to an area of higher solute concentration.Osmosis is the net movement of solvent molecules to the higher solute concentration to eqaulize the solute concentration.

48. steroids
both a and b are correct e. all are corrrect
steroids are lipophilic compounds derived from cholesterol.Lipophilic means they are easily soluble in lipids.

50. glycolysis
b. yeilds a net of two molecules of ATP for each molecule of glucose processed.It produces a net gain of 2 ATP molecules per molecule of glucose. glycolysis occurs in the cytoplasm and do not require oxygen.

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