AP BIOLOGY

CELL DIVISION

CELL DIVISION AND CANCEROUS CELLS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The mitochondria (intrinsic pathway of apoptosis) secretes two things:Cytochrome-C and SMAC. While Cytochrome-C goes on to form a complex (apoptosome), what role does SMAC play?
A
SMAC will also form a complex that initiates apoptosis
B
SMAC inhibits the anti-apoptotic properties of IAP
C
SMAC is anti-apoptotic and will bind to Cytochrome-C to reverse the apoptotic process
Explanation: 

Detailed explanation-1: -Cytochrome c (Cyt c) is an essential component of the mitochondrial electron transport chain. It is translated as apocytochrome c and then translocated into the mitochondrial IMS. Once inside the IMS, a heme group is attached to form the holocytochrome c.

Detailed explanation-2: -Under normal conditions, cytochrome c resides into the mitochondria. Exodus of cytochrome c into the cytoplasm induces the non-inflammatory process of apoptosis, whereas once translocated into the extracellular space it may trigger inflammation.

Detailed explanation-3: -The mitochondrial pro-apoptotic protein SMAC/Diablo participates in apoptosis by negatively regulating IAPs and activating caspases, thus encouraging apoptosis.

Detailed explanation-4: -Intrinsic Pathway. The intrinsic signaling pathways that initiate apoptosis involve a diverse array of non-receptor-mediated stimuli that produce intracellular signals that act directly on targets within the cell and are mitochondrial-initiated events.

There is 1 question to complete.