Flagellar Structure and Function

The video explains how bacteria use flagella to move, detailing the structure and function of these helical appendages. It describes the flagellar motor, powered by a proton gradient, and the assembly process involving various proteins. The video also covers the roles of different components like the stator, rotor, and basal body in flagellar function and assembly.

What is the primary function of bacterial flagella?

• To help bacteria reproduce

• To absorb nutrients

• To propel bacteria through their environment

• To protect bacteria from predators

How many flagella do E. coli cells typically have?

• None

• Multiple

• Two

• One

What are the three main parts of a flagellum?

• Filament, hook, basal body

• Basal body, rotor, filament

• Hook, rotor, stator

• Filament, rotor, stator

What powers the flagellar motor?

• ATP

• Proton gradient

• Oxygen

• Glucose

Which protein is involved in proton conductance in the flagellar motor?

• FLE F

• Mode B

• Mode A

• FLE G

What initiates the assembly of flagella?

• Dissociation of the hook cap

• Binding of protons

• Formation of the MS ring

• Rotation of the cap

Which proteins form the stationary part of the flagellar motor?

• Rod and hook

• L and P rings

• Mode A and Mode B

• FLE F and FLE G

What is the role of the L and P rings in gram-negative bacteria?

• To rotate the filament

• To bind protons

• To penetrate the outer membrane

• To form the MS ring

How do filament proteins reach the distal end during assembly?

• Through the hollow channel inside the filament

• By dissociating the L ring

• By binding to the hook cap

• By rotating the cap

Approximately how many subunits can a complete filament consist of?

• 30,000 to 40,000

• 40,000 to 50,000

• 20,000 to 30,000

• 10,000 to 20,000