Cell Cycle and MAPK Pathway Concepts

The video explains the human body's cell renewal process, emphasizing the importance of regulated cell death and division. It details the cell cycle phases, checkpoints, and the role of the MAPK pathway in signal transduction. The video also covers gene expression changes and transcription regulation, highlighting how extracellular signals can alter protein expression patterns.

What is the approximate number of cells in the human body?

• 30 trillion

• 20 trillion

• 10 trillion

• 40 trillion

What can happen if cell division in the gut is too slow?

• Improved digestion

• Increased energy

• Leaky intestinal wall

• Cancer

Which phase of the cell cycle involves DNA replication?

• M phase

• G2 phase

• S phase

• G1 phase

What is the role of checkpoints in the cell cycle?

• To stop cell division permanently

• To ensure cell division only proceeds if conditions are right

• To increase cell size

• To speed up cell division

What is the G0 phase known for?

• Cell death

• Metabolically active state

• Active cell division

• DNA replication

What triggers the MAPK pathway?

• Extracellular growth factor

• Cell size increase

• Internal cell damage

• Nutrient deficiency

Which protein does EGF bind to in the MAPK pathway?

• EGFR

• HER2

• Ras

• SOS

What is the function of GRB2 in the MAPK pathway?

• To phosphorylate proteins

• To activate Ras

• To mediate signal from receptor to intracellular proteins

• To bind to DNA

What is the role of Myc in the MAPK pathway?

• To regulate gene expression

• To degrade proteins

• To bind to EGFR

• To activate Ras

How does the MAPK pathway affect gene expression?

• By stopping cell division

• By degrading DNA

• By cross-linking DNA strands

• By changing protein expression patterns