Question

1.Proteins which end up embedded in the plasma membrane

a.will be translated on the ribosome, which will be incorporated into vesicle where it will finish its translation on its destined membrane

b.will start their translation on a free ribosome and the ribosome will dock to the ER will it will complete its translation

c.will start their translation on a ribosome on the ER and complete its translation there

d.will have a ER rentention signal associated with it

2.A protein which is translated in the cytosol and needs to end up in the mitochondria

a.will have a mitochondrial signal sequence associated with it, and will be transported in vesicles from the ER

b.will have a mitochondrial signal sequence associated with it

c.wll have a nuclear localization signal associated with it

d.will never happen. Proteins found in the mitochondria are made in the mitochondria!

3.Vesicles are

a.deliver their cargo by lysing

b.made from the membrane from which they bud

c.are made of unique membranes synthesized in the cytosol

d.are important in delivering proteins into the nucleus

4.The Golgi apparatus

a.is involved in exocytosis and modifying sugars

b.is only involved in endocytosis

c.is involved in exocytosis

d.doesn't really have an important cellular function

Answer 1

1)c.will start their translation on a ribosome on the ER and complete its translation there

2) b.will have a mitochondrial signal sequence associated with it

3. b.made from the membrane from which they bud

Vescicles are constantly forming from plasma membrane, ER and golgi apparatus.

4. a) is involved in exocytosis and modifying sugars

Secretory vesicles formed from the trans golgi network release their contents to the cell exterior by exocytosis. The golgi enzymes catalyse the addition or removal of sugars from cargo proteins.