Lecture 10 Part 2 Flashcards
1
Q
what occurs when there is an AA deficiency
A
- poor growth
- reduced milk and egg production
- anorexia
- infertility
2
Q
absorption of proteins and AAs during 1st 24 hours after birth
A
- large proteins
- immunoglobins from colostrum
- these large particles wont be able to be digested after first 24 hours
3
Q
absorption after 24 hours
A
proteins digested and absorbed as AAs and peptides
4
Q
digestion of proteins
A
- begins in gastric stomach
- small intestine (pancreatic region) that gives products of free AA, dipeptides, and tripeptides
5
Q
pepsinogen + HCL=
A
pepsin
6
Q
what hydrolyzes peptide bonds between specific AAs
A
Pro carboxypeptidase–> carboxypeptidase
7
Q
absorption of AAs and peptides
A
- occurs in small intestine
- free AAs absorbed by active transport systems
- absorption rate vary
8
Q
ruminant absorption of AAs and peptides
A
may also occur in rumen and omasum
9
Q
where are dipeptides and tripeptides absorbed
A
- into mucosal cells
- hydrolyzed to FAA before entering circulation
10
Q
what are AAs used for
A
- tissue protein synthesis
- synthesis of enzymes, hormones, other metabolites
- transamination-AA biosynthesis
- deamination and use of carbon skeleton for energy
11
Q
tissue protein synthesis
A
- occurs in every cell of body, hormonal control
- takes place at ribosome
- requires tRNA, rRNA, mRNA, DNA
12
Q
tRNA
A
caries specific AA and base pairs with mRNA
13
Q
rRNA
A
part of ribosome
14
Q
mRNA
A
determines AA sequence of a protein
- codons of 3 nucleotides
15
Q
DNA
A
genetic code
