what is the difference between DNA & RNA? • (11 votes) to be more specific, there are 3 main RNA types: mRNA (matrix) - is copied from DNA, to later copy proteins off it, rRNA (ribosomal) - is what ribosomes are made of, and it makes proteins, using mRNA, tRNA (transport) - holds amino acids, which are later brought to rRNA with mRNA to make proteins. (30 votes) When are mutations more likely to occur in the cell cycle? Is there a specific stage in mitosis or phase that leaves the DNA extremely susceptible or vulnerable to mutations? Or can mutations occur at any given moment? When is the DNA most vulnerable to external factors that could create mutations in the genetic code? • (15 votes) 4 years ago Posted 4 years ago. Direct link to tyersome's post “Interesting question!I'...” Interesting question! I'm not sure how well studied this is, but the consensus seems to be that mutations mostly happen during DNA synthesis — i.e. S phase. A major reason for this is that DNA synthesis introduces many errors — some of which are not corrected. (25 votes) Can you give a short summary of mitosis using the steps?? • (0 votes) The cell goes through 4 steps (prophase, metaphase, anaphase, and telophase.) The cells at the end of the process also have the same amount of chromosomes as the parent cell. At the end, 2 cells are produced. Mitosis is used to make body cells, and occurs in the body. (28 votes) Why do cells divide than grow • (7 votes) 4 years ago Posted 4 years ago. Direct link to Life Learner's post “I think they grow to acco...” I think they grow to accommodate for the doubling of new organelles and the split of DNA in later stages. After that, then they split. I hope it helps :-) (11 votes) What is the DNA inside a cell called? genetic material or chromosome? • (6 votes) DNA is genetic material, and the way it is physically present in our nuclei is by being condensed into chromosomes. (7 votes) How long does it take for a cell to fully grow? Days, weeks? • (5 votes) It really depends from cell to cell. Division and growth of cells take 24 hours for many human cells, but liver cells take more than a year and neuronal cells take many years and once they fully develop they never re-enter the cell cycle. For example, sex cells, spermatozoids take 74 days to fully finish the cycle, while oocyte sometimes takes 40 years. (meiosis starts when the female embryo is in mom's uterus and stops until puberty, then that same oocyte may not be 'unlocked' until the age of 40+). (6 votes) How does a cell copy its DNA? • (3 votes) Hi Thandeka, The way a cell copies its DNA is actually a pretty complex (but very interesting!) process. There are quite a few steps to this, but the main process that copies the DNA of a cell is called transcription. Khan Academy has some fantastic videos about transcription, you can watch one using the following link: Happy learning! (5 votes) About the mitosis. Why does a cell have to divide? Is it because our body needs more cells because others die? For example if you make a cut onto your finger. If that's the case, what about the inner cells, say, cells of liver or heart? • (2 votes) Many cells have a limited life span, so mitosis needs to occur so that healthy, living cells can be maximized. (6 votes) what is the correct order of how they occur in the cell cycle. • (2 votes) 1) Interphase (following phases listed in order of occurrence) (5 votes) Is the g0 phase in the cell cycle? • (2 votes) The G0 phase is a period in the cell cycle in which cells exist in a quiescent state. G0 phase is viewed as either an extended G1 phase, where the cell is neither dividing nor preparing to divide, or a distinct quiescent stage that occurs outside of the cell cycle. So, yes, the answer is yes. (5 votes)Want to join the conversation?
To sum up, DNA holds information on how to make all proteins, and all the RNA work to make them.
- G1
- if any errors occur from the G1 phase,
the cell will enter the G0 phase instead
of moving onto the S phase. There are
instances in which cells automatically
go into the G0 (nondividing) phase.
Neurons are an example of nondividing
cells that enter the G0 phase
permanently.
- S
- G2
2) Mitosis (the following is listed in order of occurrence)
- prophase
- prometaphase
- metaphase
- anaphase
- telophase + cytokinesis
Phases of the cell cycle (article) | Khan Academy (2023)
(Video) Cell cycle phases | Cells | MCAT | Khan Academy
(Video) Interphase | Cells | MCAT | Khan Academy
(Video) Phases of Mitosis
(Video) The Cell Cycle (and cancer) [Updated]
Videos
1. MITOSIS, CYTOKINESIS, AND THE CELL CYCLE
(Neural Academy)
2. Mitosis | Cells | MCAT | Khan Academy
(Khan Academy)
3. Mitosis: The Amazing Cell Process that Uses Division to Multiply! (Updated)
(Amoeba Sisters)
4. Phases of Meiosis
(Khan Academy)
5. Cell cycle control | Cells | MCAT | Khan Academy
(khanacademymedicine)
6. Comparing mitosis and meiosis | Cells | MCAT | Khan Academy
(Khan Academy)
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