The isoelectric point of an amino acid is A) the pH at which ...

[captainjonesify]

The isoelectric point of an amino acid is
 
  A) the pH at which it exists in the basic form.
  B) the pH at which it exists in the acid form.
  C) the pH at which it exists in the zwitterion form.
  D) the pH equal to its pKa.
  E) the pH equal to its pKb.

Question 2

When 7.00  1022 molecules of ammonia react with 6.00  1022 molecules of oxygen according to the chemical equation shown below, how many grams of nitrogen gas are produced? 4 NH3(g) + 3 O2(g)  2 N2(g) + 6 H2O(g)
 
  A) 1.63 g
  B) 1.86 g
  C) 4.19 g
  D) 6.51 g

Question 3

Which of these amino acids has a thiol group as part of its side chain?
 
  A) cysteine
  B) tyrosine
  C) histidine
  D) threonine
  E) methionine

[djpooyouma]

Answer to Question 1

C

Answer to Question 2

A

Answer to Question 3

A

[captainjonesify]

TYSM

[helenmarkerine]

Thanks for the timely response, appreciate it