AVS Exam 2 Proteins

What type of bond links amino acids together?

Peptide bonds

Name two examples of fibrous proteins.

Keratin and collagen

What is the primary structure of a protein determined by?

The sequence of amino acids in the polypeptide chain

Which hormone initiates protein digestion in the stomach?

Gastrin

What enzyme activates pepsinogen into pepsin?

Hydrochloric acid (HCl)

What are the two main types of protein-digesting enzymes?

Endopeptidases and exopeptidases

Where does most microbial protein synthesis occur in ruminants?

The rumen (reticulorumen)

What is bypass (rumen escape) protein?

Protein that is not degraded by rumen microbes and is digested in the small intestine

Name two feed ingredients that are good sources of bypass protein.

Heat-treated soybean meal, fish meal, blood meal, cottonseed meal.

What are the building blocks of proteins?

Amino acids

Which of the following is a fibrous protein?

Keratin

Pepsin is first secreted as which inactive form?

Pepsinogen

What stimulates pepsinogen release?

Gastrin

True/False: Bypass protein is digested in the rumen.

False

True/False: Birds excrete nitrogen primarily as uric acid.

True

True/False: Transamination requires Vitamin B12.

False

True/False: Protein digestibility is measured using dietary intake and fecal output.

True

True/False: Lysine is a common limiting amino acid in corn soy diets.

True