Ch. 3 Study Questions

Question 1

Indicate whether the following peptides are hydrophilic or hydrophobic.

a. MLWILAA
b. VAIKVLIL
c. CSKEGCPN
d. SSIQKNET
e. YAQKFQGRT
f. AAPLIWWA
g. SLKSSTGGQ

Answer 1

a. MLWILAA - hydro
b. VAIKVLIL - hydro
c. CSKEGCPN - hydro
d. SSIQKNET - hydro
e. YAQKFQGRT - hydro
f. AAPLIWWA - hydro
g. SLKSSTGGQ - hydro

Question 2

Is the following peptide positively or negatively charged at neutral pH?

GWWMNKCHAGHLNGVYYQGGTY

Answer 2

x

Question 3

Consider an RNA template made from a 2:1 mixture of C:A. What would be the three amino acids MOST frequently incorporated into protein?

Answer 3

x

Question 4

What is the peptide sequence encoded in AUAUAUAUAUAUAUA …?

Answer 4

x

Question 5

Write the anticodons 5’ to 3’ of the following amino acids:

a. L
b. T
c. M
d. H
e. R
f. I

Answer 5

a. L -
b. T -
c. M -
d. H -
e. R -
f. I -

Question 6

A protein contains the sequence LGEKKWCLRVNPKGLDESKDYLSLKSKYLLL. What is the limey function of this protein?

Answer 6

x

Question 7

A histone-like protein contains the sequence PKKGSKKAVTKVQKKDGKKRKRSRK. What characteristic of this sequence makes it likely to associate with DNA?

Answer 7

x

Question 8

A procedure for digestion of DA with restriction enzyme includes a final incubation step of 5 minutes at 95C. What is the likely purpose of this final step?

Answer 8

x