Chapter 7- Proteins and Amino acids (Oct 13 lec)

Question 1

amino acids are the building blocks for ____. Which do animals require in the diet?

Answer 1

proteins

require amino acids

Question 2

There are __ naturally occurring amino acids, __are found in protein and ~__ are essential in the diet

Answer 2

500
20
10

Question 3

Describe the common structure of amino acids

Answer 3

• basic amino group on one side (NH)
• acidic carboxyl group (-COOH) on the other end
• R group (side chain) that’s unique to each AA
• draw it

Question 4

amino acids are chemically classified based on the properties of the R group

Answer 4

• polarity
• charge
• hydrophilic/ hydrophobic
• branched/ straight

Question 5

chemical characteristics influence amino acid ____

Answer 5

behavior

Question 6

AA are nutritionally classified based on dietary requirement:

Answer 6

• indispensable vs dispensable (essential vs non essential)
• conditionally indispensable
• semi-indispensable (can be synthesized from an indispensable precursor)

Question 7

___ is non-essential because it can be synthesized from methionine

Answer 7

cysteine

Question 8

Taurine \_\_\_(is/ is not) in protein
- It's a major component of \_\_\_ and functions in \_\_\_\_ protection and \_\_\_\_\_ fxn

Answer 8

not in protein
bile

antioxidant
cardiovascular

Question 9

Taurine in cats:

Answer 9

occurs as a free amino acid in cats (moves through the blood as taurine)
- required in the diet

Question 10

Describe the difference between L and D configuration of amino acids

Answer 10

L Configuration:

• amino group is on the left side
• occur in nature in L configuration
• L configuration only one absorbed

D configuration:

• amino group is on the right side
• not absorbed

Question 11

Exception to “D configuration amino acids don’t get absorbed” =

Answer 11

methionine: D-met is converted to L-met in the body