Plants depend upon to take up nitrogen gas and make it available to them as organic nitrogen (natural fertilizer).

a.
soil

b.
water runoff

c.
dead organisms

d.
bacteria

i think it's d

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?