ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: khalil on May 13, 2009, 04:04:21 pm

Title: 08 exam!
Post by: khalil on May 13, 2009, 04:04:21 pm

For q 10 on the MC section, do we have to actually calculate the molar mass of A,C,G and T. Wouldn't that take long? Is there a trick to it?

Title: Re: 08 exam!
Post by: Toothpaste on May 13, 2009, 04:31:03 pm

You have to know which ones are pyrimidines and which ones are purines.

Purines are double ringed (bigger!)
Pyrimidines are single ringed

A, G = purines
C, T (and U) = pyrimidines
You can check this in the data booket

For the molar mass bit, which strand has the most purines?
(most A's and G's)

Title: Re: 08 exam!
Post by: khalil on May 13, 2009, 04:41:58 pm

Thanks for  the help but I don't think that will work. They have equal amounts of purines

Title: Re: 08 exam!
Post by: Toothpaste on May 13, 2009, 04:42:39 pm

Quote from: khalil on May 13, 2009, 04:41:58 pm

Thanks for  the help but I don't think that will work. They have equal amounts of A's and G's

No, as in compare all the strands. Which one has more A and G's rather than T and C's? (The first strand there has 100% A and G's)

Title: Re: 08 exam!
Post by: khalil on May 13, 2009, 04:46:50 pm

Wow talk about fast service. It took you 41s to reply.

Sorry my mistake...thanks! X)