1.4(b) - Hydrophobic signals and control of transcription Flashcards
1
Q
Since Hydrophobic signal molecules are hydrophobic, they can do what?
A
Diffuse directly through the phospholipid bilayer of membranes
2
Q
What do hydrophobic signal molecules bind to?
A
Intracellular receptors
3
Q
What are transcription factors?
A
proteins that can either stimulate or inhibit initiation of transcription
4
Q
What are the receptors for hydrophobic signal molecules?
A
Transcription facotrs
5
Q
Example of hydrophobic signals?
A
Steroid hormones such as oestrogen and testosterone
6
Q
What happens when a steroid hormone enters a cell?
A
It activates a specific receptor and forms a hormone-receptor complex
7
Q
What happens to the hormone-receptor hormone?
A
Binds to specific sites on DNA called Hormone Release Elements
