Week 3

Question 1

In E. coli, the number of amino acids in a peptide crosslink is
A. Four because even though the repeat units are made with five
amino acids, the terminal D-Ala is removed upon reacting with
the GlcNAc in the adjacent strand
B. Five because each repeat unit is made with five amino acids
C. Nine because the terminal D-Ala of one chain is lost upon
crosslinking
D. Ten because the DAP in one tetrapeptide covalently binds the D-
Ala in the other, removing two D-Ala moieties

Answer 1

Nine because the terminal D-Ala of one chain is lost upon
crosslinking

Question 2

What is in the bacteria cell wall? What about archaea?

Answer 2

Bacteria have peptidoglycan and archaea have pseudomuerin

Question 3

what is the order of assembly of a bacterial flagella?
1. hook attatched
2. basal body
3. hollow tube with subunits add to the tip
4. strator attatchment

Answer 3

basal body
strator attachment
hook attatchmtn
hollow tubes with subunits add to the tip