Question

1.) Which of the following is NOT an extracellular signal used to control arrangement of actin filaments?

	a.	Cdc7
	b.	Surplus of Ca2+
	c.	Rac activation
	d.	A & B
	e.	B & C

2.)

Proteins destined for the mitocondria must pass through the golgi body before reaching their final destination

True

False

3.)

Which of the following is FALSE about channel proteins?

	a.	transfers molecules one at a time by changing conformation
	b.	binds with greatest specificity of all membrane transport proteins
	c.	small charged molecules can travel through
	d.	A & B
	e.	A & C

Answer 1

1) A- cdc7

cdc7 or cell division cycle 7 -related protein kinase is an enzyme that is involved in regulation of the cell cycle during chromosomal DNA replication and is not involved in activation of actin filaments

2) false

proteins that need to be transported across the mitochondrial membranes utilize a number of translocation machineries that contains proteins called porins.

The machinery in the outer membrane is called the Tom complex (Translocator outer membrane) and that for the inner membrane is called the Tim complex (Translocator Inner Membrane).

3) D- A and B

Channel proteins form a water filled passage made og hydrophillic proteins that trasfer ions and polar solutes across the membrane.

On the other hand Carrier proteins bind to the solute that is being transported. The binding results in a change in conformation, that leads to its internalization adn finally the release of the solute inside the cell.

Hence Carrier proteins bind with greater specificity and transfer molecules one at a time acros the membrane,