1. The structure of the unfolded pentapeptide GYYRS would have what net charge at pH 7.4?

A) -3

B) -2

C) -1

D) 0

E) +1

F) +2

G) +3

2. stretch of 14 amino acids form a single alpha helix of length

A) 1.5 A

B) 3.6 A

C) 5.4 A

D) 21 A

E) 34 A

F) 50.4 A

G) 75.6 A

47.) Which of the following best explains why mRNAs from insects would be difficult to express as protein in yeast cells?

A) The yeast cells have prokaryotic ribosomes, whereas insect cells have eukaryotic ribosomes.

B) The differences in snRNAs between yeast and insects would make proper splicing exceeding difficult or impossible.

C) Yeast cells do not place 5' caps on their mRNAs, whereas insect cells do.

D) The splicing factor U3 binds differently between the two cell types.