Learn about the different types of proteins that exist on the cell membrane. By William Tsai. Created by William Tsai.
Watch the next lesson: https://www.khanacademy.org/test-prep/mcat/cells/cell-membrane-overview/v/cell-membrane-fluidity?utm_source=YT&utm_medium=Desc&utm_campaign=mcat
Missed the previous lesson? https://www.khanacademy.org/test-prep/mcat/cells/cell-membrane-overview/v/cell-membrane-overview-fluid-mosaic-model?utm_source=YT&utm_medium=Desc&utm_campaign=mcat
MCAT on Khan Academy: Go ahead and practice some passage-based questions!
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s MCAT channel: https://www.youtube.com/channel/UCDkK5wqSuwDlJ3_nl3rgdiQ?sub_confirmation=1
Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Great video!!! But I don't think carbonhydrates are also located at the interior side of the membrane, or am I wrong? It wouldn't make sense to locate carbonhydrates on this side, since there are no cells to interact with
Wait, in my textbook, it says that are are passive transport proteins (no ATP) and active transport protein (uses ATP), so is the passive transport protein basically channel protein and active transport protein carrier protein?
I finally understood this. After watching 100000000 other videos on this by different people, your video actually helped me understand this all. Thank you so much! I feel more confident for my test on Saturday :)
No. Channel proteins facilitate ONLY passive diffusion for specific substances such as ions, and other relatively large polar molecules. This makes sense because most, or maybe (all), of the time, channel proteins have a hollow tube-like structure which allows the passage of different substances down their respective concentration gradient. BUT (though I'm not very sure), other transport proteins such as cotransporters use the indirect pass of energy(ATP), which is the potential energy released when molecules such as ions move down their concentration gradient, by a nearby active transport pump to allow the passage of certain molecules against their concetration gradient.
Yes I thought the same thing, I think carbonhydrates only appear on the outher surface of the membrane because they function as signalling proteins, so it would make no sense if they were located also at the interior side of the membrane, since there are no cells to interact with at this side
Hey, amazing video. Explained it better than my lecturers. I'm trying to understand the GPI Anchor in a basic sense but cannot get my head around it. Would it be possible to give a brief description of what it is and how it works please? Thanks in advance! x
Fakhri Hakim Wassup, basically carrier proteins are the only proteins that can use ATP for active transport (the correct term that is missing in the video) meaning it can transport molecules AGAINST the concentration gradient unlike channel proteins. However, if the molecules that needs to be transported from the outside of cell to the inside follows the concentration gradient (from high to low) then facilitated diffusion occurs.
The classical Yeast two-hybrid (Y2H) screening is mostly limited to the study of cytosolic or extracellular soluble #proteins. To study the interaction of transmembrane protein interaction, #Profacgen provides a specialized membrane-based Y2H (#MbY2H) system. Visit http://www.profacgen.com/membrane-based-yeast-two-hybrid-screening.htm to know more!
would really like to advise u one thing, always give a significance/ importance of each and everything you are presenting in the vedio. like..what is the significance of lipid bound protein, why it is present there, theremust be some reason
+Elaibe Law Adenosine triphosphate, essentially the energy currency of cells. It helps power certain cell processes through its hydrolysis (addition of a water molecule to break one of the phosphate bonds, thus releasing the energy stored in that bond), creating ADP (adenosine diphosphate) and Phosphate as a result.
Antidepressants are medications that can help relieve symptoms of depression, social anxiety disorder, anxiety disorders, seasonal affective disorder, and dysthymia, or mild chronic depression, as well as other conditions.
They aim to correct chemical imbalances of neurotransmitters in the brain that are believed to be responsible for changes in mood and behavior.
Depression Medications (Antidepressants)
These are the most commonly prescribed type of antidepressant.
Serotonin and noradrenaline reuptake inhibitors (SNRIs) are used to treat major depression, mood disorders, and possibly but less commonly attention deficit hyperactivity disorder (ADHD), obsessive-compulsive disorder (OCD), anxiety disorders, menopausal symptoms, fibromyalgia, and chronic neuropathic pain.
SNRIs raise levels of serotonin and norepinephrine, two neurotransmitters in the brain that play a key role in stabilizing mood.
Selective serotonin reuptake inhibitors (SSRIs) are the most commonly prescribed antidepressants. They are effective in treating depression, and they have fewer side effects than the other antidepressants.
SSRIs block the reuptake, or absorption, of serotonin in the brain. This makes it easier for the brain cells to receive and send messages, resulting in better and more stable moods.
They are called "selective" because they mainly seem to affect serotonin, and not the other neurotransmitters.