OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Proteins
|
|
|
RNA
|
|
|
DNA
|
|
|
Carbohydrate
|
Detailed explanation-1: -Chargaff’s rules states that DNA from any cell of all organisms should have a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.
Detailed explanation-2: -In a DNA sample, the percentage of adenine is 40% and percentage of thymine is 60%. What is your inference? According to Chargaff’s rule, Concentration of adenine=concentration of thymine. therefore if [A]=40% then the [T] will also be 40%.
Detailed explanation-3: -Chargaff’s rule only applies to DNA. RNA is single-stranded, and thus, no base pairing occurs. Think of a strand of DNA. Each base pairs with a specific partner, allowing us to determine their percentages: adenine and thymine are always equal, and cytosine and guanine are always equal.