3.3 DNA Structure
Terms in this set (5)
3.3.1 Outline DNA nucleotide structure in terms of sugar (deoxyribose), base and phosphate.
Building block of DNA is called a nucleotide.
Each nucleotide is made of 3 parts:
A sugar called deoxyribose shown as a pentagon;
A phosphate group shown as a circle;
A base shown as a rectangle.
3.3.2 State the names of the four bases in DNA.
Adenine(A), Thymine(T), Cytosine(C), and Guanine(G)
3.3.3 Outline how DNA nucleotides are linked together by covalent bonds into a single strand.
Two DNA nucleotides can be linked together by a covalent bond between the sugar of one nucleotide and the phosphate group of another nucleotide.
You can add more nucleotide in a similar way to form a strand of nucleotides.
3.3.4 Explain how a DNA double helix is formed using complementary base pairing and hydrogen bonds.
A DNA molecule consist of two strands of nucleotides wound together into a double helix.
H bonds link the two strands together.
These H bonds form between the bases of the two strands.
C is the complementary base of G and A is the complementary base of T.
It means that A only forms H bonds with T and C only form H bonds with G.
3.1.5 Draw and label a simple diagram of the molecular structure of DNA.
two polymers shown;
arranged in a double helix;
sugar shown connected to base;
sugar-phosphate backbone shown;
sugar identified as deoxyribose;
hydrogen bonding between bases shown;
diagram shows complementary base pairing:
A bonded to T, C with G;
complementary base pairing is explained in the annotation.
covalent bonding between phosphate and sugar.
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