Question

Question 4 Select the correct Haworth projection for B-D-erythrofuranose. CH OH ОН ОН CHOCH3 ОН CH2OH OCH3 ОН ОН ОН. он ОН он ОН ОН ОН ОН ОН — = ПІ IV о I III IV II

Answer 1

4. Correct Haworth projection for β-D-erythrofuranose is II

The correct structure of the cyclic hemiacetal that forms under acidic conditions when 5-hydroxy-4-methylpentanal cyclizes based on the numbering of carbon atoms is

OH

Percentage of guanosine is 20% which is equal to the percentage of cytosine. So, remaining is 100% - 40% = 60%.

Remaining 60% is 30% thymine and 30% adinine.

So, the percentage of thymine residues is 30%