4-16 Cell Signaling (Cambridge AS & A Level Biology, 9700)
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- Опубликовано: 25 июл 2024
- 3:20 How does Cell Signaling take place
5:50 What is Signal Transduction?
8:20 What is a Cascade Reaction?
10:50 What is Signal Amplification?
13:04 Putting it all together!
For exams during the AS period, the following questions are usually asked.
How does Cell-to-Cell Communication/Cell Signaling take place?
- A cell releases a CHEMICAL SIGNAL/LIGAND
- The ligand binds to a COMPLEMENTARY RECEPTOR on the cell surface membrane of the target cell
- the target cell undergoes SIGNAL TRANSDUCTION
- a response is produced within the cell
What is an example of Signal Transduction?
- In signal transduction, the G Protein activates a membrane enzyme
- A SECONDARY MESSENGER is produced
- This begins a CASCADE REACTION
- the signal is AMPLIFIED within the cell
- a response is produced within the cell
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Sir I have a question .
When ligand is secreted from the sending cell into the extracellular space and travels to the target cell , here it bind to the receptors at the cell membrane of the target cell itself right?! Then I don’t get what happen after that there are chemical messengers inside the cell that triggers a response , please confirm and explain the last part .
Thank you
so, the ligand is referred to as a primary messenger (or first messenger). Problem is, the ligand cannot enter the cell (possibly because it's too big or polar)
What the cell does is, produces another signal within the cell called the secondary messenger, and quite often, the secondary messenger is a molecule called cAMP.
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Hello sir, will you complete AS Level syllabus by March 2024? Please let me know
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@@OtterBioTutor I really really hope you could finish the syllabus before june.. you're such an amazing tutor my school really needs a teacher like you.. no honestly, the whole world needs you
I'm a bit confused as to why you didn't cover chapter 7, but you did cover chatper 8.
I am also confused why you are doing chapter 4 now. I guess by the time you reach A2 Syllabus, I'll already graduate lol.
Lmao probably!🦦
I've been so confused with this part of the chapter for so long and it's finally resolved :) thanks! 🦦