THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Analysis of a molecule of DNA found it to contain 200 adenine bases, 20% of the total number of bases in the strand. How many phosphate groups did it contain?
|
|
200
|
|
|
400
|
|
|
800
|
|
|
1000
|
Explanation:
Detailed explanation-1: -A segment of DNA contains 1200 nucleotides, of which 200 have adenine base.
Detailed explanation-2: -Since adenine is 20%, then thymine is 20% as well. The total of both is 40%. From 100 remains 60% which is divided equally between guanine and cytosine, so each is 30%. Uracil is not found in DNA but it will have the same percentage as thymine, i.e the RNA will have 30% uracil.
Detailed explanation-3: -In a segment of DNA molecule there occurs 200 molecules of adenine nitrogen bases and 200 molecules of cytosine nitrogen bases.
Detailed explanation-4: -Since cytosine and guanine are always present in equal numbers, the percentage of guanine molecule is 30%.
There is 1 question to complete.