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Chemotaxis in E. coli

View the animation below, then complete the quiz to test your knowledge of the concept.

1Which of the following statements about the E. coli methyl-accepting chemotaxis proteins is TRUE?
A)they are found in the cell wall
B)they are directly connected to the flagellum
C)they interact with CheW and CheA
D)A and B
E)A, B and C

2If E. coli is moving up an attractant gradient, which of the following will happen?
A)CheA will autophosphorylate
B)levels of CheY-P will increase
C)short runs and a lot of tumbling
D)long runs with no tumbling
E)none of the above

3Which of the following proteins have antagonistic functions?
A)A) CheR and CheB-P
B)CheR-P and CheB
C)CheA and CheY-P
D)CheA-P and CheY
E)CheA-P and CheY-P

4Counterclockwise rotation of flagella causes runs, while clockwise rotation causes tumbles.

5The protein CheZ dephosphorylates CheY-P.

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