Signal Transduction and Gene Expression

Mr. Anderson explains signal transmission and gene expression, focusing on how epinephrine affects the body. He describes the signal transduction pathway, detailing how signals are amplified and lead to changes in cell function and gene expression. The video uses the example of adrenaline's role in the fight or flight response, illustrating how it triggers glucose release and gene expression through a series of biochemical steps.

What is the primary chemical involved in the fight or flight response?

• Dopamine

• Serotonin

• Epinephrine

• Cortisol

How does epinephrine affect cells in the liver?

• It causes them to release glucose

• It causes them to produce insulin

• It causes them to store glucose

• It causes them to absorb oxygen

What is the role of a receptor protein in signal transduction?

• To store energy

• To transmit electrical signals

• To produce hormones

• To pick up chemical messages

What is cyclic AMP (cAMP) derived from?

• Glucose

• ATP

• DNA

• RNA

Why can't epinephrine directly enter the cell?

• It cannot cross the lipid layer

• It is broken down outside the cell

• It is repelled by the cell membrane

• It is too large

What is the purpose of signal amplification in the transduction pathway?

• To reduce energy consumption

• To increase the number of glucose molecules released

• To prevent signal loss

• To slow down the response

What happens when the catalytic subunit is activated in the signal transduction pathway?

• It stores glucose

• It activates phosphor

• It produces insulin

• It releases oxygen

What is the role of CREB in gene expression?

• It stores DNA

• It inhibits RNA polymerase

• It acts as a transcription factor

• It degrades proteins

How does epinephrine influence gene expression?

• By directly altering DNA

• By activating transcription factors

• By producing new DNA

• By inhibiting RNA synthesis

What is the ultimate result of signal transduction in terms of gene expression?

• Expression of specific genes

• Increased glucose storage

• Inhibition of cell division

• Increased protein degradation