In order to understand the functions of DNA and RNA in the cell, you must first

Question

In order to understand the functions of DNA and RNA in the cell, you must first understand their structures, and how these structures change under varying conditions. Indicate whether the following statements are true or false regarding the properties of DNA and RNA. If the statement is false, provide a correction to the statement. (6 marks)

a) Base pairing only occurs in DNA, not RNA.

b) In a test tube, both DNA and RNA will undergo spontaneous hydrolysis at the same rate.

c) The UV absorbance of RNA will increase as the temperature increases.

d) The varied structure of DNA makes it an ideal molecule for the storage of genetic information.

e) The absorbance of DNA will be affected by the pH of the solution.

f) In a DNA molecule the number of A=G and T=C.

Explanation / Answer

a) FALSE-Base pairing also occurs in RNA. Here also purines and pyrimidines are present adenine, guanine, cytosine and uracil

b) FALSE- In RNA the 2 hydroxyl group makes the hydrolysis rate faster and the DNA is more stable than that of RNA.

c) FALSE

d) TRUE

e) TRUE

f) FALSE- In DNA molecule the number of adenine(A) forms double bond with thymine(T) and Guanine(G) forms triple bond with Cytosine(C).

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