OCR Biology F212 (Molecules, Biodiversity, Food and Health)- 21st May 2012

What was the colorimeter question actually asking?

I answered it by describing how to use the colorimeter to determine the concentration, but my friend thought it asked how to determine the concentration WITHOUT a colorimeter?

HELP

i think its WITHOUT a colorimeter...
but i have no idea how

Reply 3881

BulletproofHeart

Original post by mollster57

What was the colorimeter question actually asking?

I answered it by describing how to use the colorimeter to determine the concentration, but my friend thought it asked how to determine the concentration WITHOUT a colorimeter?

HELP

yh it was asking how they'd do the test, because the student didn't have a colorimeter.

Reply 3882

Axion

15

Original post by mollster57

What was the colorimeter question actually asking?

I answered it by describing how to use the colorimeter to determine the concentration, but my friend thought it asked how to determine the concentration WITHOUT a colorimeter?

HELP

it was without. First you descirbe the benedicts test.

Then you describe a method without.

I said eaither measure precipitate or use a colour shade chart (I made the colour shade chart up :smile:

)

Reply 3883

twizzzzzzter

2

Original post by mollster57

What was the colorimeter question actually asking?

I answered it by describing how to use the colorimeter to determine the concentration, but my friend thought it asked how to determine the concentration WITHOUT a colorimeter?

HELP

It did say without a colorimeter. IE compare filtrate/precipitate colour with filtrate/precipitates from known concentrations and see which the colour closest resembles

Reply 3884

BulletproofHeart

What did everyone put for the % Q about the smokers?

Reply 3885

superduperr

Original post by danigraciela

polysaccharide? that what I put

no it was a beta glucose?

Reply 3886

Meme4

1

Original post by TurtleG

i think its WITHOUT a colorimeter...
but i have no idea how

Filter the percipitate and weight it?

Probably wrong :frown:

Reply 3887

Maxima

8

A method without a colourimeter would be to compare the masses of the filtrates, centrifuging etc.

I can't believe I thought it was with lol. Gives me some comfort to know other people are in the same boat as me. You think they'd at least offer some marks still?

Reply 3888

PrincessMedic

2

Original post by mollster57

What was the colorimeter question actually asking?

I answered it by describing how to use the colorimeter to determine the concentration, but my friend thought it asked how to determine the concentration WITHOUT a colorimeter?

HELP

I think it was asking to describe how to test for a non-reducing sugar and then determine the concentration without a colorimeter. I said that they can judge by looking at the colour of the precipitate formed...don't know if it's correct though :redface:

Reply 3889

twizzzzzzter

2

Original post by BulletproofHeart

What did everyone put for the % Q about the smokers?

11.1% anything in the region would be accepted (depends on how many DP you read the graph to)

Reply 3890

John Dogg

1

Original post by BulletproofHeart

What did everyone put for the % Q about the smokers?

11.3%

Reply 3891

mollster57

Original post by im so fresh

same ):
hate myself for that.

I put envrionmental and genetic as well, I can't believe I didn't click on that it was continuous and discontinuous! I know them as well :-(

Reply 3892

imconfused

10

Original post by falcoe

Okay who got 11.3 ???

This was posted from The Student Room's iPhone/iPad App

that was me... by the way (i got 11.3%) but how comes posted this at 3:00, we finished at 3:20...

Reply 3893

BorisGlichington

13

Original post by Meme4

Filter the percipitate and weight it?

Probably wrong :frown:

You either time how long it takes to change colour, or see what stage it stops at (e.g. not Brick Red)

Reply 3894

Nerdy Pig

2

Original post by BulletproofHeart

What did everyone put for the % Q about the smokers?

I think i got 12.7% decrease :confused:

Reply 3895

Axion

15

for the amylose similarities and differences I put:

Similarity = they are both unbranched

Difference = amylose is coiled, this one is not :/

Reply 3896

JanembaJanemba

OMG AAHAHHHHSAFDHSAHFHSAHGFHSAHHHADHGDA

That's my response to this homosexual exam.

Reply 3897

AliceD

1

Original post by Meme4

Filter the percipitate and weight it?

Probably wrong :frown:

That's what i put :smile:

Reply 3898

Mr Clingfilm

Absolutely spiffing paper, didn't enjoy the fact that there was nothing on DNA replication or immune response but apart from that the questions were easily worded if you knew the specification.