Week 12+13 Make-up Quiz

The F₀ domain of the ATP synthase

• Binds ADP and P_i

• Rotates in a central axis inside a ring of αβ-heterodimers

• Allows protons to diffuse down their concentration gradient

• Is comprised of a heterohexamer

• Is an active transport pore

In general, phosphorylation potential describes...

• the ability of a certain molecule to lose or gain a phosphate group

• the ability of a certain molecule to give off a phosphate group

• the ability of a certain molecule to gain a phosphate group

• the ability of ATP to give off its phosphate group

• the ability of PEP to give off its phosphate group

Phosphorylation of ATP occurs at the _________ subunit of ATP synthase

• β-subunit

• Δ-subunit

• α-subunit

•   γ-subunit

• δ-subunit

An uncoupler uncouples...

• ATP synthase from binding ADP

• ATP synthesis from the ETC

• the ETC from electron shuttling

• electrons from being passed along the electron transport chain

• electron carriers from accepting electrons

Introducing a one-way channel allowing magnesium to enter into the intermembrane space from the cytosol would likely have what effect?

• No effect

• Increased proton motive force

• Uncoupling

• Instant death

• Immortality