Let's see what we have got in our One Stop
Science box!
Wow!
Come and have a look.
We have got blue beads,
OK!
Orange beads,
Orange beads, alright!
Yellow beads, red beads, brown beads and green beads.
Six different kinds of beads,
Yes.
Alright!
And now we have got two kinds of pipe cleaners.
Hmmm Hmmm
One orange and one black.
Okay!
And we have got rulers and scissors.
Let me get this out of the way.
Let's organize the beads a little, and make
a double helix DNA strand.
Let's use the black pipe cleaner of the rungs
of the DNA strand.
So, we will cut out 5 cm each.
8 pieces of them, okay.
OK
One, we need 8 of this.
Be careful not to cut yourself.
DNA or deoxyribonucleic acid, is the hereditary
material in humans and almost all other organisms.
Each chromosome is made up of DNA
tightly coiled many times around proteins
called histones that support its structure.
DNA contains all the genetic information of
the human body.
Now we are going to use two of those orange
pipe cleaners.
As DNA strands we are going to bead
them with two different colors:
blue and yellow.
Blue on top and yellow.
Can you put them?
8, right?
Yes, 8.
Let's make sure that we keep the distance
of 4 cm between each pair of beads,
so that we have enough space for the rungs.
Yeah, we are good.
So, now we have to make
the rungs for the DNA strands.
So this time we will make two pairs.
Orange and red together and
green and brown together.
When we put the rungs on the strands,
remember that the rungs have to come between the two bead:
The yellow and the blue.
And we go in order of alternates.
If the beads are green and brown here,
the next one becomes…
Guess?
Red and orange!
Right.
And after that, we will take another,
brown and green, but in alternate orders.
Let's put that together.
Bend the wire on one strand,
between the two beads.
4 cm apart and then the next
one would be brown and green.
On a DNA, the proteins are always
present in matching pairs!
DNA basis pair with each other,
A with T and C with G,
to form units called base pairs.
A, C, T and G stands for Adenine, Cytosine,
Thymine and Guanine.
Each base is also attached to a sugar
molecule and a phosphate molecule.
Together, a base, sugar, and
phosphate are called a nucleotide.
Nucleotides are arranged in two long strands
that form a spiral called the double helix.
And there we have it, that's the last one.
Right!
And there we go.
That's our double helix DNA strand.
If you want to make yours at home,
here is what you need:
Beads in six colors,
ruler,
pipe cleaners in two colors
and scissors.
This is your souvenir, Sharon.
Thank you!
I will show this to my friends now.
I am so glad you came by.
Thank you so much.
