0
G1, or gap 1, is the first stage of interphase. The other stages of interphase are: S (synthesis), G2 and then finally M (mitosis). There is also a G0 stage where the cell is not preparing for division. For example nerve cells are continuously in this stage as they do not divide.
G1 is like the cell cycle control stage. If the cell is not ready to divide, it does not pass this stage. During this stage the cell is checking that it is ready to start DNA replication in the S stage. There are many check points in G1 that are regulated by cyclins and cyclin dependant kinases (cdk's). CDK's are protein complexes. Kinases are enzymes that can activate or inactivate other proteins by phosphorylation. The things that could halt G1, and thus a protein inhibiting the complex, include cell damage and DNA damage. The cycle then halts until the cell has repaired the damage. If the damage is irreparable, proteins will then signal the start of apoptosis (programmed cell death). Tumour supressors such as p21 and p53, and RB (retino blastoma) also play a role in the cycle. To pass into S stage the cell must pass the restriction point. After this point the cell has commited to dividing.
It is when these checkpoints and cycles go wrong that cancer can persist, hence th name tumour suppressor. When cells divide uncontrollably, and divide when damaged, cancer can arise.
A significant amount of cancers have defected tumour supressor proteins.
During G1 phase of the cell cycle, the major thing happening to a cell is growth and preparation for DNA replication in the upcoming S phase. The cell accumulates nutrients, increases in size, and synthesizes proteins required for DNA replication.
The cell is growing and, most importantly, checking to see that replication is possible during the next phase which is synthesis. Checks and repairs to the genetic material happen during G1.
Add your answer:
Earn +20 pts
What are the two major events during the mitotic phase of the cell cycle?
The two major events during the mitotic phase of the cell cycle are mitosis, where the duplicated chromosomes are separated into two identical sets, and cytokinesis, which is the division of the cytoplasm and organelles to create two daughter cells.
What cell organelle moves DNA during cell division?
The spindle apparatus is responsible for moving DNA during cell division. It is made up of microtubules and helps to separate the sister chromatids to opposite ends of the cell during mitosis and meiosis.
Every cell in every living thing comes from another cell that does what?
Every cell in every living thing comes from another cell that divides through a process called cell division. During cell division, a cell makes a copy of its genetic material and divides into two daughter cells that are identical to the original cell. This allows for growth, repair, and maintenance of living organisms.
Which is a major difference between the cell membrane and the cell wall?
One major difference is that the cell membrane is a flexible barrier that surrounds the cell and regulates what enters and exits the cell, while the cell wall is a rigid structure located outside the cell membrane that provides structural support and protection to the cell.
Name 2 things that occur during telophase 1?
The nuclear membrane and nucleolus (these had disappeared during prophase). They had originally disappeared during prophase because the chromatin condensed into chromatids and then coiled into chromosomes and needed to seperate. They reappear during telophase because the chromatid uncoils again to form chromatin. This means that the cell no longer needs to seperate so it can reform the membrane and nucleolus.
What is major happening to a cell during G1 phase?
Growth
What is a major thing happening to a cell during?
The cell is growing and, most importantly, checking to see that replication is possible during the next phase which is synthesis. Checks and repairs to the genetic material happen during G1.
What is happening To a cell during g1 phase?
Growth
What is the major ingredient in any cell or living thing?
water
What cotroles what is happening in a cell?
cell membrane
What occurs during in the during the cell cycle in plants but not in animals?
formation of a cell plate
What major things happens to the cell during G1?
The cell explodes and turns into a cellular banana. Then it poops...
What is the major function of asters of centrosome in a cell?
The major function of asters in the centrosome is to help organize and control the movement of microtubules during cell division. They are essential for proper spindle formation and chromosome segregation during mitosis. Asters also play a role in positioning the centrosome within the cell.
What is the first thing produced in meiosis?
The first thing produced in meiosis is a cell with half the number of chromosomes as the original cell, known as a haploid cell. This cell is formed during meiosis I, which involves the separation of homologous chromosomes.
What is the effect of an error during transcription?
If you mean in DNA transcription: 1. have no effect 2. produce a mutation 3. cause death of the cell in which this is happening
What is one major structure that an animal cell shows during mitosis that a plant cell does not show?
Astra rays on both sides of the spindle
Is WWE hell in a cell really happening?
yes
