| Direction: Read the following and answer the questions from given below Erwin Chargaff was one of those men, making two discoveries that led James Watson and Francis Crick to the double helix structure of DNA. At first Chargaff noticed that DNA whether taken from a plant or animal-contained equal amounts of adenine and thymine and equal amounts of cytosine and guanine. These equalities provides clues into the chemical pairing that make up the double helix. In addition Chargaff also found that amounts of guanine, cytosine, adenine and thymine vary by species are indication that DNA, not protein might be the genetic material for life. |
| (iv) In a DNA strand of length 340 A, there are |
A) 100 nucleotides
B) 100 base pairs
C) 100 nitrogenous bases
D) 100 sugar phosphates
Correct Answer: B
Solution :
[b] Distance between consecutive bases is 3.4 A. 340 A means, it has 340/3.4 = 100 base pairs.
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