1
Question
How does the nucleus play a crucial part , along with the environment in determining the way the cell will develop or exhibit at maturity, by directing the chemical activities of the cell? And what are the chemical activities?
Open in App
Solution
In a cell, the nucleus functions as the control center. The nucleus contains the genetic “program” which directs the cell’s behavior, very much like a computer program.
This program is encoded in a set of enormous and complex molecules called chromosomes, which are made out of deoxyribonucleic acid(DNA). The instructions encoded by the chromosomes are copied and sent out from the nucleus to the main part of the cell, where they are interpreted by other complex molecules called ribosomes and cause the assembly of yet other complex molecules called proteins. These proteins then carry out all of the various tasks that the cell needs to do in order to live. The instructions for making one protein are called a gene.
Certain proteins are sent back into the nucleus, where they latch on to parts of the chromosomes and either block those parts from being copied or encourage them to be copied more. Sometimes these proteins will latch on only when certain other molecules are around, or will let go their grip when certain other molecules are around. This causes the kind of non-linear feedback that is necessary for complex behavior.
Certain other proteins are sent to the outer membrane of the cell, where they poke through to the outside world. When they sense certain conditions in the outside world, they send signalling molecules into the cell; some of these signalling molecules go in to the nucleus, where they interact with the proteins that are latched on to the chromosomes. In this way, the cell’s controlling program can change according to the conditions in which the cell finds itself.
Some parts of the chromosomes are chemically modified so they cannot be copied at all. These parts of the genetic program are turned off completely. In a multi-cellular animal with many different kinds of cells (like us humans) each cell turns off the parts of the genetic program it doesn’t need. So the genes that are only necessary for nerve cells are turned off in all of the other cells, for example.
The nucleus plays the central role in Cellular reproduction. Cellular reproduction is the process by which a single cell divides and forms two new cells. Apart from that, the nucleus also plays a vital role in determining the way the cell will develop and what form it will at maturity, (by directing the chemical activities of the cell) attain.
Read more on Brainly.in - https://brainly.in/question/4089994#readmore
This program is encoded in a set of enormous and complex molecules called chromosomes, which are made out of deoxyribonucleic acid(DNA). The instructions encoded by the chromosomes are copied and sent out from the nucleus to the main part of the cell, where they are interpreted by other complex molecules called ribosomes and cause the assembly of yet other complex molecules called proteins. These proteins then carry out all of the various tasks that the cell needs to do in order to live. The instructions for making one protein are called a gene.
Certain proteins are sent back into the nucleus, where they latch on to parts of the chromosomes and either block those parts from being copied or encourage them to be copied more. Sometimes these proteins will latch on only when certain other molecules are around, or will let go their grip when certain other molecules are around. This causes the kind of non-linear feedback that is necessary for complex behavior.
Certain other proteins are sent to the outer membrane of the cell, where they poke through to the outside world. When they sense certain conditions in the outside world, they send signalling molecules into the cell; some of these signalling molecules go in to the nucleus, where they interact with the proteins that are latched on to the chromosomes. In this way, the cell’s controlling program can change according to the conditions in which the cell finds itself.
Some parts of the chromosomes are chemically modified so they cannot be copied at all. These parts of the genetic program are turned off completely. In a multi-cellular animal with many different kinds of cells (like us humans) each cell turns off the parts of the genetic program it doesn’t need. So the genes that are only necessary for nerve cells are turned off in all of the other cells, for example.
The nucleus plays the central role in Cellular reproduction. Cellular reproduction is the process by which a single cell divides and forms two new cells. Apart from that, the nucleus also plays a vital role in determining the way the cell will develop and what form it will at maturity, (by directing the chemical activities of the cell) attain.
Read more on Brainly.in - https://brainly.in/question/4089994#readmore
Suggest Corrections
4
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
