Some biology practical doubts

[narutogirl]

Don't worry about being astigmatic (I'm about 90% sure I'm astigmatic too, I just forget what the eye-doctor exactly said since I see him like once in a year and a half. >.>) Just don't remove your glasses when looking at the slide like most people do. It'll be a bit uncomfortable, but you'll see it properly.

the funny thing is, I don't wear eye glasses, i just let my eyes deteriorate...stupid me >.<
I have one more question about serial dilution, in M/J 2007 paper 31
they asked to prepare different concentrations of lead nitrate using serial dilution, but they didn't give us how to preform it so I tried doing it using the formula c1v1=c2v2...since the most important thing is to have the solutions within specific intervals..the basic solution had 1%, so i made 0.8, 0.6, 0.4, 0.2..is that right?

 

[AhmedNES]

saed how can u do the dilution of a 1.5% in the other way.

 

[raamish]

the funny thing is, I don't wear eye glasses, i just let my eyes deteriorate...stupid me >.<
I have one more question about serial dilution, in M/J 2007 paper 31
they asked to prepare different concentrations of lead nitrate using serial dilution, but they didn't give us how to preform it so I tried doing it using the formula c1v1=c2v2...since the most important thing is to have the solutions within specific intervals..the basic solution had 1%, so i made 0.8, 0.6, 0.4, 0.2..is that right?

for example in making 10cm3 of water of conc 0.8 u used 2cm of water and 8cm3 of solution rite?

 

[narutogirl]

for example in making 10cm3 of water of conc 0.8 u used 2cm of water and 8cm3 of solution rite?

yeah, exactly.

 

[sarahnafea]

Stop worrying "narutogirl" (wink)...LOL I'll see you tomorrow<3

 

[Saad (سعد)]

please reply quickly. if u cant post your diagrams(although if u can plzz) then tell me the layers of bronchiole and trachea for e.g. trachea has epithelium then cartilage(i dont know in which layer) . After that i am confused which layers will come. HELPPPP

Do you have Salma Siddiqui's "Practical Biology" book? If you do, you can find everything there.

In the 'TS of Tracheal Wall', just remember 'Epithilium' is the uppermost layer which contains Goblet cells, then under that is 'Lamina Propria' which contains connective tissue, smooth muscle, blood vessels and submucosa and underneath that is your cartilage.

In the bronchiole, there's a lamina propria which is thin (the outermost layer in contact with the lumen, which is a wavy line, usually stained dark, like the tunica intima in a blood vessel) - this is elastic. This is completely surrounded by a smooth muscle layer.

That's all I can do, I guess. Hope that helps insha'Allah.

 

[narutogirl]

Stop worrying "narutogirl" (wink)...LOL I'll see you tomorrow<3

hehe... good luck, and I will see you tom ;P

 

[Saad (سعد)]

saed how can u do the dilution of a 1.5% in the other way.

1.5% is a kind of number which cannot be done the other way, I think.

 

[sarahnafea]

im googling alveoli slides and it's hopeless rabna yostorrr

hehe... good luck, and I will see you tom ;P

 

[Saad (سعد)]

the funny thing is, I don't wear eye glasses, i just let my eyes deteriorate...stupid me >.<
I have one more question about serial dilution, in M/J 2007 paper 31
they asked to prepare different concentrations of lead nitrate using serial dilution, but they didn't give us how to preform it so I tried doing it using the formula c1v1=c2v2...since the most important thing is to have the solutions within specific intervals..the basic solution had 1%, so i made 0.8, 0.6, 0.4, 0.2..is that right?

Don't let your eyes deteriorate. It'll come back and bite you later on.

As for M/J 2007 p31... it says prepare them by serial dilution. They did tell you how to perform it. You were supposed to do it the other way; serially dilute them, from 1%, to 0.1%, to 0.01%, to 0.001%, to 0.0001%, etc.) You need at least three dilutions according to the mark scheme... 5 is best, and at least 2 readings for each solution.

The way you did it isn't serial dilution, its dilution of equal intervals... I think. I'm confused now myself.

Hope that helps insha'Allah.

 

[raamish]

Don't let your eyes deteriorate. It'll come back and bite you later on.

As for M/J 2007 p31... it says prepare them by serial dilution. They did tell you how to perform it. You were supposed to do it the other way; serially dilute them, from 1%, to 0.1%, to 0.01%, to 0.001%, to 0.0001%, etc.) You need at least three dilutions according to the mark scheme... 5 is best, and at least 2 readings for each solution.

Hope that helps insha'Allah.

and i just wanna tally that:
1)the tunica media of artey is thicker than that of vein ?
2)the tunica externa of vein is thicker than that of artery?
3) do u have the book.Can u upload the pages of lung if u can

 

[Saad (سعد)]

and i just wanna tally that:
1)the tunica media of artey is thicker than that of vein ?
2)the tunica externa of vein is thicker than that of artery?
3) do u have the book.Can u upload the pages of lung if u can

1) A lot thicker.
2) Yup, a lot thicker.
3) I have the book, but I can't upload. I don't have access to anything which I could use to upload it atm; no camera, no USB cable, no scanner. And its almost my bed-time. o_o Sorry dude.

 

[raamish]

1) A lot thicker.
2) Yup, a lot thicker.
3) I have the book, but I can't upload. I don't have access to anything which I could use to upload it atm; no camera, no USB cable, no scanner. And its almost my bed-time. o_o Sorry dude.

ok 1 last qs is tunica media of artery greater than that of its tunica externa?

 

[narutogirl]

Don't let your eyes deteriorate. It'll come back and bite you later on.

As for M/J 2007 p31... it says prepare them by serial dilution. They did tell you how to perform it. You were supposed to do it the other way; serially dilute them, from 1%, to 0.1%, to 0.01%, to 0.001%, to 0.0001%, etc.) You need at least three dilutions according to the mark scheme... 5 is best, and at least 2 readings for each solution.

The way you did it isn't serial dilution, its dilution of equal intervals... I think. I'm confused now myself.

Hope that helps insha'Allah.

I am really just confused
I hope in our exam it is clearer, what variant are you doing?

 

[narutogirl]

1) A lot thicker.
2) Yup, a lot thicker.
3) I have the book, but I can't upload. I don't have access to anything which I could use to upload it atm; no camera, no USB cable, no scanner. And its almost my bed-time. o_o Sorry dude.

number 2..the walls of the artery are much thicker than the vein, so even the externa of the artery is considered thicker than that of the vein...

 

[Saad (سعد)]

I am really just confused
I hope in our exam it is clearer, what variant are you doing?

34.

 

[sarahnafea]

34.

are 32 and 34 the same? omg coz if theyre not all the guesses are wrong andd we're screwed!

 

[narutogirl]

are 32 and 34 the same? omg coz if theyre not all the guesses are wrong andd we're screwed!

relax, see you are the one who is worrying ..okay am still frustrated over the alveoli
the guesses are isa right, and the teacher said them..here 34 has agar i suppose, but we don't

 

[Saad (سعد)]

are 32 and 34 the same? omg coz if theyre not all the guesses are wrong andd we're screwed!

Different.

And that's why, you don't rely on guesses, you rely on God.

Anyways, may Allah expand our breasts for us all and ease our ways for us all and guide us all to the straight way, Ameen, ya Arhamar-Rahimeen.

Going to bed; see you later guys.

 

[sarahnafea]

relax, see you are the one who is worrying ..okay am still frustrated over the alveoli
the guesses are isa right, and the teacher said them..here 34 has agar i suppose, but we don't

im not worrying im showing concern i have a rough drawing from mr.c i told jazz i'd bring it tomorrow but it's totally not accurate..we'll see