What is the effect of pH on the activity of enzymes?

The two samples of DNA, A and B have melting temperatures  340 and 350K respectively. Draw conclusion from this data regarding their base content.

What are polysaccharides? Name one of them. How is it important to us?

Give any two reactions of glucose to show the presence of an aldehyde group.

How will you show the presence of,
(i) primary alcoholic group.
(ii) Six carbon atoms in a straight chain in glucose.

A tipeptide on complete hydrolysis give glycine, alanine and phenyl alanine. Using three letter symbols, write down the possible sequences of the tripeptide.

If two amino acids: alanine and phenyl alanine react together, how many possible dipeptides can be formed? Write down the structures and names of each one. Also, write their names using three and one letter abbreviation for each amino acids.

178.

Which bonds in the backbone of a peptide can rotate freely and which cannot? Give reasons.

Name the purine and pyrimidine bases present in DNA and RNA. Give the structure of any one of the pyrimidine base.

State the important features of the genetic code.