Q 01/05

Mitochondria are popularly nicknamed the what of the cell?

A) Kitchen

B) Brain

C) Powerhouse

D) Post office

Answer · why

C) Powerhouse

The phrase was popularised by Philip Siekevitz in a 1957 magazine article of that name.

Q 02/05

Which energy-carrying molecule do mitochondria generate through aerobic respiration?

A) ATP

B) Glucose

C) DNA

D) Insulin

Answer · why

A) ATP

Making it aerobically yields far more energy than fermentation does.

Q 03/05

How many membranes does a mitochondrion have?

A) Three

B) None

C) One

D) Two

Answer · why

D) Two

The outer one is leaky to small molecules; the inner one is highly impermeable and packed with proteins.

Q 04/05

What are the folds of the inner mitochondrial membrane called?

A) Villi

B) Cristae

C) Thylakoids

D) Lamellae

Answer · why

B) Cristae

They boost surface area; muscle mitochondria, which need more ATP, have more of them.

Q 05/05

What is the fluid-filled space inside the inner membrane called?

A) The matrix

B) The cytosol

C) The lumen

D) The stroma

Answer · why

A) The matrix

It holds about two-thirds of the organelle's protein, its ribosomes and several copies of its DNA.