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Nucleus | Cell | Don't Memorise

Teamwork leads to greater efficiency.

Whatever be the job, a complete set of people

in co-ordination can make it possible.

But a team is usually considered incomplete

without a leader.

A leader is the one who not only guides, but

even regulates or controls the working of

other team members!

The same analogy can be used to study the

cellular organelles.

The various organelles are like the in charge

of specific functions.

And can you guess who acts like the leader here?

It’s the NUCLEUS !

You heard me right!

The nucleus is the controlling unit for every organelle.

Located right at the center of the cell,

it governs the functions of the other organelles.

But how does it regulate the activities

of other organelles?

Let’s try finding it out in this video!

The reason why nucleus is given the status

of the major cell organelle is because it

contains the GENETIC material of the organism.

Now what could this genetic material be?

If we zoom in this nucleus,

we find these tangled thread like structures.

Any idea what these structures are?

These are called the chromatin fibres !

Are they important to us in any way ?

Well, they are the most importan component

of the nucleus and even the complete cell !

Because these chromatin fibers

enclose the genetic material within them!

When the cell has to divide,

these long threads coil themselves to form a

sophisticated and compact structure called

the chromosome !

We have come across this term often!

It look somewhat like this!

These chromosomes are made up of

smaller important segments.

These functional units are called genes.

“Genes” form the basis of heredity in all organisms!

That means the similarities and variations

that organisms have with their parents!

For example , what do friends and family say

when they see a baby?

“She looks exactly like her mother”

or “She’s so much like her father”.

That is because the new born baby gets her genes

from her parents!

Now let us zoom in a bit more!

Any idea what these functional segments named genes

are made up of ?

Genes are made up of molecules of DNA.

You heard me right!

Deoxyribonucleic acid , abbreviated as DNA,

forms the genes!

So now if we go in the reverse manner,

then we have DNA molecules forming

functional segments called genes.

Many such genes come together to form the

chromosomes.

However, the compact chromosomal structure exists

only when the cell is about to divide.

So usually, when the cell is in the resting

or active phase apart from cell division,

the chromosomes exists as tangles threads

called chromatin!

In other words, chromosomes and chromatin

are the same thing!

The genetic material is locked in the form

of these chromatin threads

present in the nucleus!

Now this was about why the nucleus

is called the major organelle.

But any idea

how the system of regulation works?

Well, that happens with the help of proteins!

The genes present in the nucleus

code for specific proteins.

These proteins perform various functions

that we find in the cell.

So functions right from passing information,

communication or even building structures,

all these are carried out by the specific proteins.

That is how the nucleus helps in regulating the

various functions of the other cell organelles.

Unlike the other organelles,

even the nucleus has its own membrane that separates

the inner contents from the rest of the cytoplasm.

The membrane however has pores to allow entry

and exit of substances across it.

Also, the nucleus has its own nucleoplasm that is

slightly different from the rest of the cytoplasm.

Now that we have learned about the

ruling organelle in the cell,

let us deviate towards the other working organelles

as well!

Let’s try learning about the remaining organelles

in our upcoming videos!