The Cell Cycle and its Regulation
Your cells have to divide when you’re growing, to heal wounds, and to replace dead cells. But how do cells know when to divide and when not to divide? We can’t have cells just growing willy-nilly! That’s what cancer is, and that’s bad. Luckily, cells obey something called the cell cycle, which is regulated by a variety of signaling molecules, which tell the cell when to divide and when to chill out. Let’s look at the phases of this cycle and some of its regulatory mechanisms now.
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Hi keza
This is way better than crush-course.
thank you biology jesus
You absolutely excellent…. Lacture
after studying biology in depth for many years I have slowly but surely started believing in a higher power. And after further research I have decided that there can only be 1 God responsible for the intricacy of the human body.
Thank you so much for excellent explanation
PROFFESOR DAVE, i keep seeing ads for this Gaia crap, it sounds like stuff i have heard in highschool stoner cirlces, can u please make a video about this or maybe a series? the gaia series is a big scam!
Quick question-
Chromosomes can be monads (a single chromatid) or dyads (sister chromatids held together by a centromere; a dyad has two identical strands of DNA held closely together in a location called the centromere). When a cell is in the G1 or Gap 1 Phase of their cell cycle, the nucleus contains monads but during the S phase the DNA is synthesized into the dyads that are seen in the G2 or Gap 2 phase.
*The strands are identical assuming that no copying errors (mutations) have occurred during the S phase of the cell cycle
Familiarize yourself with the conditions of a cell’s chromosomes during the G1 and G2 phases of the cell cycle.
The 4 phases of mitosis:
Prophase = chromosomes condense
Metaphase = chromosomes line up in the middle of the cell with reference to the two poles (the equatorial plate or metaphase plate) with each chromosome on its own spindle fiber (by itself)
Anaphase = separation of the chromosomes
Telophase = formation of two nuclear envelopes around the two chromosomal clusters and then the cell divides (cytokinesis)
Questions:
In humans, there are 46 chromosomes in the nucleus of a cell. When the cells are in the G1 phase the 46 chromosomes are 46 monads which are 46 single chromatids. During the S Phase the 46 monads become 46 dyads which are 46 sister chromatids that will split during the M Phase/Mitosis. What is in the nucleus of the cell after mitosis?
Are the cells representing a plant cell or animal cell?
Thanks King
İ wish to have you in my collage dude, i didn't just learn, i enjoyed it
5:00, 5:20, 5:52, 6:40!, 6:50!, 7:22!, 7:40!, 8:35, 9:44, 10:25, 10:51!, 11:08!
1:57 it's actually "We, humans, …" sorry not sorry lol
Thank professor dave
Thanks 👍👍
@dave So Cyclins and kinases provide the signal to help the cell move along through the checkpoints…but how do they know the cells are "fit" to continue forward to the next phase.
It's well explained. Thank u
you are saving my life right now thank youuuu
Please make videos with more explanation ….request. Your videos are best .
While cells are just being cells, Prof Dave is being his usual compartmentalized messiah self 🙂
I just like the into
I am here for 0:08
How is this guy a professor. He is what, 32?
EDIT: Also way too good teacher for a professor, especially in Cellbiology.
Psst spoiler, he is just a Bachelor.
"Hey, Todd!"
perfect!!! sugestion: video about mosaicism
OMG THIS IS SO HELPFUL 🌺🌺🌺
This is what I always want from a discussion, there are always new trivias/facts added and goes beyond the surface of the lesson (defining terms, explaining what is already in the ppt, and whatnot).
Professor Dave is lit af man. I look at this channel for all my college classes. The way he explains is extraordinary.
Well done 👍
This is so helpful!!
Thank youu
Well explained, understandable and clear… Thank you prof. All your videos are very useful. I've been watching all of them.
thank you professor dave
you are making a good info content to me as a 1st year nursing student. Thank you, Professor Dave!
1:03 Why are they called daughter cells? And not son cells, for example?
Thank you 😊
Lmao Kin-aces got me, it is usually pronounced kyn-ace
Controlled cellular multiplication. And age related healing and Cancer treatment.
Cell multiplication. And cellular regeneration.
Thank you thank you
This is like watching Cr1TiKaL teach me about biology. Thanks!
0:12 looks like a big strong blue guy with red head. Noone you want to argue with trying to get into a club.
one quick question dave. if nerve cells don't divide at all like you said, then how can doctors treat brain cancer? bcs, once the doctors get rid the tumor cells within the brain, don't they wait for certain amount of times so that the cells he cut form the new one. thanks
Video saved for my upcoming January exam!! Love you.
Very clear thank you
The Best ever