Chemistry, 21.07.2020 18:01 kingmichael2xx

A) The pK1, pK2, and pKR for the amino acid histidine are 1.8, 9.3, and 6.0, respectively. At pH 4.0 would be charged predominantly as follows: A. a-carboxylate 0, a-amino +1, imidazole +1, net charge +2
B. a-carboxylate +1, a-amino +1, imidazole −1, net charge +1
C. a-carboxylate −1, a-amino +1, imidazole 0, net charge 0
D. a-carboxylate +1, a-amino 0, imidazole −1, net charge 0
E. a-carboxylate −1, a-amino +1, imidazole +1, net charge +1
b) The pK1, pK2, and pKR for the amino acid arginine are 1.8, 9.0, and 12.5, respectively. At pH 7.0 arginine would be charged predominantly as follows:
A. a-carboxylate +1, a-amino 0, guanidino -1, net charge 0
B. a-carboxylate 0, a-amino 0, guanidino +1, net charge +1
C. a-carboxylate −1, a-amino +1, guanidino +1, net charge +1
D. a-carboxylate −1, a-amino 0, guanidino +1, net charge 0
E. a-carboxylate +1, a-amino −1, guanidino −1, net charge −1
c) The pK1, pK2, and pKR for the amino acid aspartic acid are 2.0, 9.9, and 3.9, respectively. At pH 7.0, aspartic acid would be charged predominantly as follows:
A. a-carboxylate +1, a-amino +1, b-carboxylate +1, net charge +3
B. a-carboxylate 0, a-amino +1, b-carboxylate 0, net charge +1
C. a-carboxylate 0, a-amino −1, b-carboxylate 0, net charge −1
D. a-carboxylate +1, a-amino −1, b-carboxylate +1, net charge +1
E. a-carboxylate −1, a-amino +1, b-carboxylate −1, net charge −1

Answers: 2

Show answers

Another question on Chemistry

Chemistry, 22.06.2019 08:30

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Answers: 2

Answer

Chemistry, 22.06.2019 12:40

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

Answers: 2

Answer

Chemistry, 22.06.2019 21:30

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.

Answers: 1

Answer

Chemistry, 22.06.2019 23:00

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

Answers: 1

Answer

You know the right answer?

A) The pK1, pK2, and pKR for the amino acid histidine are 1.8, 9.3, and 6.0, respectively. At pH 4.0...

Questions