Endospore

What is an endospore?

A dormant, non-reproductive survival structure formed by some bacteria.

Are endospores used for reproduction?

No, they are used for survival.

Where is an endospore formed?

Inside the bacterial cell.

When do bacteria form endospores?

Under unfavorable or harsh environmental conditions.

What is the purpose of an endospore?

To help the bacterium survive extreme conditions.

What is sporulation?

The process of forming an endospore.

What triggers sporulation?

Harsh environmental conditions.

What protective structure forms during sporulation?

A thick spore coat.

What is the spore coat made of?

Peptidoglycan and proteins.

What happens to water inside the developing endospore?

Water is removed.

What molecule is deposited into the endospore core?

Dipicolinic acid.

What is the function of dipicolinic acid?

Provides heat resistance and stabilizes DNA and proteins.

What happens to metabolism during sporulation?

The cell becomes metabolically dormant.

What is germination?

The process by which an endospore returns to an active vegetative cell.

What triggers germination?

Favorable environmental conditions.

What happens to water during germination?

Water re-enters the spore.

What happens to the spore coat during germination?

The layers loosen.

What happens to metabolism during germination?

The cell becomes metabolically active again.

What is the final result of germination?

A normal vegetative bacterial cell forms.

Why are endospores medically important?

They are extremely resistant to environmental stress.

Can endospores survive boiling water?

Yes.

Are endospores resistant to many disinfectants and chemicals?

Yes.

Can endospores survive drying (desiccation)?

Yes.

Can endospores survive long periods without nutrients?

Yes.

Are endospores resistant to radiation and extreme environments?

Yes.

Molecule removed during sporulation?

Water.

Molecule added during sporulation?

Dipicolinic acid.

Main purpose of dipicolinic acid?

Heat resistance and DNA stabilization.

Endospore coat composition?

Peptidoglycan and proteins.

Endospore function?

Survival.

Endospore reproduction function?

None (non-reproductive).