OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Nitrogen bases are held together by peptide bonds
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A and T, C and G always occur in equal amounts
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Proteins are the carriers of genetic information
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C and G rarely occur in eukaryotic organisms
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Detailed explanation-1: -These rules state that: The amount of adenine is always equal to the amount of thymine found in a sample. The amount of cytosine is always equal to the amount of guanine found in a sample. The proportion of the four nitrogenous bases varies from species to species.
Detailed explanation-2: -Chargaff drew the conclusion that it is in fact the DNA in the nucleus of the cell that carries genetic information rather than the protein.
Detailed explanation-3: -It specifies that the amounts of guanine and cytosine be the same. While the ratios of adenine and thiamine are the same. This rule was named after Erwin Chargaff, who discovered it in 1950. According to this model, the percentage of nitrogenous base pairs is equal to the percentage of double-stranded DNA.
Detailed explanation-4: -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 provided clues into the chemical pairings that make up the double helix.