Protein Metabolism

Question 1

where does Protein digestion begins

Answer 1

in the stomach

Question 2

• its denaturing action “unwinds” globular proteins, making peptide bonds more accessible to digestive enzymes, and
• its acidity leads to the activation of pepsinogen, which is the inactive form of the digestive enzyme pepsin; because of the hydrochloric acid present, gastric juice has a pH between 1.5 and 2.0.

Answer 2

hydrochloric acid

Question 3

stimulates pancreatic production of bicarbonate ion

Answer 3

secretin

Question 4

protein degradation&raquo_space; protein synthesis,

Answer 4

negative nitrogen balance

Question 5

nitrogen intake&raquo_space;> nitrogen output

Answer 5

positive nitrogen balance

Question 6

The entire collection of free amino acids in the body.

Answer 6

amino acid pool

Question 7

nterchange of the amino group of an a-amino acid with the keto group of an a-keto acid

Answer 7

transamination reaction

Question 8

Conversion of an amino acid -NH2 group to an α-keto group, with removal of NH4+

Answer 8

Oxidative deamination