1. The maltose-binding protein (MBP) of Escherichia coli is a periplasmic protei

Question

1. The maltose-binding protein (MBP) of Escherichia coli is a periplasmic protein made of 370 amino acids that is secreted through SecYEG. SecA would use______

ATP molecules to assist with translocation of MBP.

a. 1

b. 370

c.19.

d.18

e.20

2.Why is ATP hydrolysis required for these transporters to operate properly?

Choose one:

A. because it causes a conformational change to open the channel to the other side

B. because it causes a plunger effect to push the molecule through the channel

C. because it causes a hydrophobic change to propel the molecule through the channel

D. because it causes a rotation of the channel to spin the molecule through to the other side of the membrane

A. GroES

B. cycles of ATP binding and hydrolysis

C. heat shock

D. clamp structure

A. nonselective binding of RNA polymerase to DNA.

B. binding of RNA polymerase to consensus sequences on DNA.

C. helping replicate the DNA helix.

D. mRNA binding to promoter regions.

Explanation / Answer

1. Answer: E) 20

Sec A used 20 atp in the process. SecA would be interacting with the different components. Though it consists of different domains, the atp molecules are 20

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