rohith

A reaction occurs at a pH of approximately 5. Which of the following buffer systems would be best used to make a solution with this pH?

Select one:

a. [CH3COOH] :[CH3COO-]

b. [H2PO4-]: [HPO42-]

c. [H2CO3] :[HCO3-]

d. none of these.

Which of these is a general feature of the lipid bilayer in all biological membranes?

a) individual lipid molecules are free to diffuse laterally in the surface of the bilayer

b) individual lipid molecules in one monolayer of the bilayer readily diffuse (flip-flop) to the other monolayer.

c) polar, but uncharged, compounds readily diffuse across the bilayer

d) the bilayer is stabilized by covalent bonds between neighboring phospholipid molecules.

e) the polar head groups face inward toward the inside of the bilayer

Which of the following aqueous solutions will have the lowestfreezing point?

A) .5 m C12H22O11 (sucrose)
B) .5 m Ca(NO3)2
C) .5 m NiSO4
D) .5 m Li3 PO4

What is the energy, in Joules, of one mole of photons associated with visible light having a wavelength of ?

a.  

b.  

c.  

d.