1. For each structure, circle the sugar unit and identify the nucleotide as a ribonucleotide or a deoxyribonucleotide. a. b. HO-P-0 ОН НО- OH OH NH₂ OH OH NH₂

Given the structures of the ribonucleotides as (shown in Image A) and deoxyribonucleotides (as shown in Image B), Draw the structure of the polyribonucleotide UAGCCUG and the structure of thepolydeoxyribonucleotide CGTAGAT.

1. What is the name of the nucleobase in the nucleotide structure? a. guanineb. adeninec. thymined. uracil 2. Is the nucleobase a purine or a pyrimidine?

draw the structure of the polynucleotide GT

Go to Figure 5.23 a and, for the top three nucleotides, number all the carbons in the sugars, circle the nitrogenous bases, and star the phosphates.

Given the structures of the ribonucleotides and deoxyribonucleotides: Adenine Uracil Thymine HN Adenine NH HO-P-0- CH2 HO-P-0 CH2 HO-P-0-CH2 HO-P-0-CH он он он он OH H OH H Cytosine Cytosine Guanine Guanine NH2 NH NH2 CH2 HOo CH2 HO-P-0 -CH2 он он он он OH H OH H • Draw the structure of the polyribonucleotide UAGCCUG. Draw the structure of the polydeoxyribonucleotide CGTAGAT.

Identify if the following is a pyrimidine/purine nucleotide or a pyrimidine/purine nucleoside and write whether the sugar moiety is a ribose or deoxyribose. NH2 NH2 HO-P-o HO В. ÓH ÓH ОН H3C. NH HN но С. OCH2 CH2 D. H. OH он OH

Identify the base shown below. Drag the correct base to the rectangle in the image O I HN H₂N Adenine Cytosine N N IZ 5 methyl cytosine H Guanine Thymine

Draw the dinucleotide CU. Show structures of the bases

3. Identify if the following is a pyrimidine/purine nucleotide or a pyrimidine/purine nucleoside and write whether the sugar moiety is a ribose or deoxyribose. NH2 ŅH2 N- ofoka N- 'N. HO-P-O HỌ. А. В. ÓH OH ОН ОН OH