Chargaff discovered that:
A. the tetranucleotide hypothesis was correct
B. for any organism, the amount of A was equal to the amount of T
C. DNA was a double helix
D. for any organism, the amount of T was equal to the amount of C and the amount of G was equal to the amount of A

The pyrimidines are:
A. adenine and guanine
B. cytosine and guanine
C. cytosine and thymine
D. ribose and deoxyribose

Question

Chargaff discovered that:
A. the tetranucleotide hypothesis was correct
B. for any organism, the amount of A was equal to the amount of T
C. DNA was a double helix
D. for any organism, the amount of T was equal to the amount of C and the amount of G was equal to the amount of A

The pyrimidines are:
A. adenine and guanine
B. cytosine and guanine
C. cytosine and thymine
D. ribose and deoxyribose

anonymous · Answer

Chargaff was the scientist who discovered that in DNA, the number of Adenine (A) is always equal to the number of Thymine (T). And the number of Guanine (G) is always equal to the number of Cytosine (C). Take a look at this picture: http://dedunn.edublogs.org/files/2011/06/cbp-1mvporq.gif You can see there, why A is equal to T, and G is equal to C. It's because they pair with one another. ~~~~~~~~~~~~~ The PYRIMIDINES are THYMINE and CYTOSINE. They are smaller than their PURINE partners: adenine and guanine. Take a look at this picture: http://prancer.physics.louisville.edu/astrowiki/images/4/42/Dna_purines_pyrimidines_fig2.jpg