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BASE PAIRING IN DNA
Adenine bonds with Thymine (A-T) by a double bond. This means in a DNA molecule, the number
of adenine equal the number of thymine.
Guanine bonds with Cytosine (G-C) by a triple bond. This means in a DNA molecule, the number of
guanine equal the number of cytosine
REMEMBER
AT/GC = MEANS Adenine and Thymine. Guanine and Cytosine
Best way to remember base pairing
ATGC = Are The Girls Cool ( see the bold letters are ATGC)
Questions
1. A DNA molecule has 40% of it bases as Thymine, how many percent will be Guanine? (2)
2. A DNA molecule has 300 base, if 30% are guanine, how many of the bases are
a. Adenine
b. Cytosine
c. Nucleotides
3. One strand of DNA molecule has 10 adenine, 20 cytosine, 15 guanine and 30 thymine. How
many :
a. Bases are present in the DNA molecule?
b. Nucleotides are present in the DNA molecule?
c. bases are cytosine on this molecule?
d. bases are Thymine on this molecule?
(hint : DNA is double stranded)
4. In DNA, if the sequence of bases is AGG TTA CCG, the corresponding bases are
NB:
Adenine and thymine are complementary bases
Guanine and cytosine are complementary bases
TYPES OF BASES
1. PURINE BASES: adenine and guanine
2. PYRIMIDINE BASES: thymine and cytosine
NB: purine bases bonds with pyrimidine bases on the DNA structure. A-T and G-C.
A-T-G-C = purine-pyrimidine-purine-pyrimidine

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BASE PAIRING IN DNA Adenine bonds with Thymine (A-T) by a double bond. This means in a DNA molecule, the number of adenine equal the number of thymine. Guanine bonds with Cytosine (G-C) by a triple bond. This means in a DNA molecule, the number of guanine equal the number of cytosine REMEMBER AT/GC = MEANS Adenine and Thymine. Guanine and Cytosine Best way to remember base pairing ATGC = Are The Girls Cool ( see the bold letters are ATGC) Questions 1. A DNA molecule has 40% of it bases as Thymine, how many percent will be Guanine? (2) 2. A DNA molecule has 300 base, if 30% are guanine, how many of the bases are a. Adenine b. Cytosine c. Nucleotides 3. One strand of DNA molecule has 10 adenine, 20 cytosine, 15 guanine and 30 thymine. How many : a. Bases are present in the DNA molecule? b. Nucleotides are present in the DNA molecule? c. bases are cytosine on this molecule? d. bases are Thymine on this molecule? (hint : DNA is double stranded) 4. In DNA, if the sequence of bases is AGG TTA CCG, the corresponding bases are … NB: Adenine and thymine are complementary bases Guanine and cytosine are complementary bases TYPES OF BASES 1. PURINE BASES: adenine and guanine 2. PYRIMIDINE BASES: thymine and cytosine NB: purine bases bonds with pyrimidine bases on the DNA structure. A-T and G-C. A-T-G-C = purine-pyrimidine-purine-pyrimidine Name: Description: ...
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