biochem questions - vitaminb6

[ArchivalUser]

At physiologic ph (7.4) hexa peptide arginine will have a net charge of:

A.-2
b. -1
c. 0
d. +1
e. +2


Which of the following type of bonds is covalent?

a. hydrogen
b. disulphide
c. electrostatic
d. hydrophobic bonds

[ArchivalUser]

1.
2. disulphide

[ArchivalUser]

1 argenin is basic aa
2disulphide

[ArchivalUser]

1e
2b

[ArchivalUser]

sorry 1 is A

[ArchivalUser]

2 is B.....................can u explain why 1 is A?????

[ArchivalUser]

because by using simple equation pH= pKa - log B/B+
and in this case pH is below pKa
pKa of argenine is 9 or something like that