Disposal of the Unneeded

Question 1

Autophagy “self eating”

Answer 1

sweeps up bits of cytoplasm and organelles into double-membrane vesicles called autophagosomes then delivered to lysosomes for digestion

Question 2

Ubiquitin-Proteasome Pathway

Answer 2

Ubiquitin proteins attach to marked proteins ready for destruction and then hydrolyzed by proteasomes

Question 3

Apoptosis

Answer 3

“cell death” gets rid of the body cells that are programmed to have a limited life span