24 Question (2 points) See section 18.9 For the DNA bases guanine and cytosine, select the nitrogen atom(s) whose lone-pair electrons are included in the aromatic pi system. ("A" represents an unspecified group.)
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Guanine: ``` O || N / \ C N / \ / \ N---C---N | | N---C | A ``` Cytosine: ``` O || N / \ C N / \ / N---C | | N---C | A ``` Show more…
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Answer the following questions about the four DNA nucleobases shown above: What are the names of the nucleobases designated as (II) and (IV)? (4 points, 2 points each) (II) (IV) Draw structural formulas of DNA nucleobases in boxes and (III), which form Watson-Crick base pairs with the DNA nucleobases shown in (II) and (IV) (6 points, 3 points each) C. Is nucleobase (I) purine or pyrimidine? (1 point) Answer: D. Is nucleobase (III) purine or pyrimidine? (1 point) Answer: Question 12 (2 points): Which of the following are possible base compositions for double-stranded DNA? %A %G %C %T %U B. 43 C. 15 35 35 None of the above All of the above
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24. Draw a nucleotide and label the three main parts. 25. The purine nitrogenous bases are and 26. The pyrimidine nitrogenous bases are and 27. Circle the nitrogenous base above found only in RNA, not in DNA. 28. Define "antiparallel" as it applies to DNA.
1. You have a sample of DNA, and you measure the amount of adenine present at 21%. Based on this, the percentages of the other three nitrogenous bases must be ______. Group of answer choices thymine 21% A. uracil 21% B. guanine 29% C. guanine 21% D. cytosine 29% E. cytosine 21%
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