unit 4

Question 1

destinations of proteins from free ribosomes

Answer 1

cytosol, nucleus, internal side of plasma membrane, peroxisomes, chloroplasts, mitochondria

Question 2

nuclear localization signal

Answer 2

stretch of positively charged amino acids (lysine and arginine)

Question 3

importin

Answer 3

receptor that recognizes NLS and brings protein into the cell

Question 4

Ran

Answer 4

enzyme in the nucleus that binds to importin to get it to release the protein it carries, then uses GTP to remove itself once the importin goes back through the nuclear pore