Iliness showed that there were two different types of DNA Question 4
Analysis of DNA samples from a patient with
DNA were isolated and put into separate test tubes. The analysis of the nitrogenous base composition of each
present. One was double-stranded human DNA and the other was single-stranded viral DNA. The two types of
test tube is shown in the table below.
Adenine
22.1
Test tube 1
Nitrogenous base composition (%)
Cytosine Guanine Thymine
27.9 27.9 22.1
31.3 18.7 18.9
Test tube 2
31.1
(1)
(2)
1. Which test tube (1 or 2) contains viral DNA?
2. Explain your answer to question 1.