| 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. |
| (v) Assertion [A] If the sequence of bases of one DNA strand is known then the sequence of other strand can be predicted. |
| Reason [R] Both the strands of DNA are complementary to each other. |
A) If both A and R are true and R is the correct explanation of A
B) if both A and R are true, but R is not the correct explanation of A
C) If A is true, but R is false
D) If A is false, but R is true
Correct Answer: A
Solution :
[a] Both A and R are correct and R is the correct explanation of A. In polynucleotide chains like DNA base pairings are said to be complementary to each other. Therefore, if the base sequence of one strand is known then the sequence of other strand can be predicted.
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