u guahihe(G) ule 10.1 Overview of DNA structure The double helix structure is a
ID: 257815 • Letter: U
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u guahihe(G) ule 10.1 Overview of DNA structure The double helix structure is a twisted ladder. DNA urwn-containing phosphate molecules and that the rungs are paired ni composed of sugar and is shows that the sides of the ladder are bases end one 5 end 3 end hydrogen bands Observation: DNA Structure Study a model of DNA, or if a DNA-RNA model kit is available, construct a DNA molecule. 2. With reference to DNA's ladder-type structure, what molecules make up the sides of the ladder What molecules make up the ladder rungs? Notice that the base adenine (A) is always paired with the base thymine guanine (G) is always paired with the base cytosine (C). What is this called? (T) and that the base 3. 122 Laboratory 10 Molecular Genetics 10-2Explanation / Answer
The answer to question 2
Sides of the ladder is made up of alternating sugar and phosphate molecules. The sugar present in DNA is deoxyribose and in RNA it is ribose. Rungs of the DNA are made up of 4 types of nitrogenous bases paired together by hydrogen bonds. The nitrogenous bases are of two types purines (Adenine and guanine) and pyrimidines (Thymine, cytosine, and uracil).
The answer to question 3
Adenine always pairs with Thymine and Guanine always pair with cytosine, this is called as the complementary base pairing.
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