Cytosine makes up 15% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine? 30% 35% 85% O 70%
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Cytosine makes up 15% of the
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- If thymine makes up 15% of the nitrogenous bases in a specific DNA molecule, what percent of the bases are cytosine? O 15% O 30% 35% O 42.5% O 70% 85%Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. The composition of the remaining bases is % adenine, % guanine, and % thymine.A double stranded DNA fragment contains 12% adenine residues. What is the percentage of cytosine residues? O 76% O 12% О 38% O 24% O o oo
- There are four types of nucleotides in DNA molecules. Which of the following is NOT one of the four types of DNA nucleotides? O Adenine O Cytosine O Guanine O Thymine O ValineDNA has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. One aspect of DNA that allows it to accurately store genetic information is the base pairing from Chargaff's first rule of the four nucleotide bases. If the A content of a DNA molecule is 18%, what are the percentages of the remaining bases? T = G = C = % % %Hydrolysis of the N-glycosyl bond between deoxyribose and a purine base in DNA creates an apurinic (AP) site. An AP site is more thermodynamically destabilizing to a DNA molecule than is a mismatched base pair. Examine the structure of an AP site. H₂N HN N O™ -O-P-O-CH₂ Guanine H₂N N HN Select the chemical consequences that could contribute to DNA instability at AP sites. H H 1₂0/ H fewer hydrogen bonds between the unpaired pyrimidine base and water disruption of the base-stacking interactions decreased interaction between the mutated DNA strand and histones increased ability of the deoxyribose ring to open without the attachment of the purine base H H Guanosine residue (in DNA) O™ -O-P-O-CH₂ O H H H O Apurinic residue H OH H
- A double stranded DNA fragment contains 22% cytosine residues. What is the percentage of thymine residues? 44% 28% 22% O 56%Given the active site diagram below, please identify the residue participating in a charge-charge interation. HO OH HN OH 5 ΝΗ *HN ΝΗ OH O Zn²+ 2 4 5 3 1 2 NH 3Hydrolysis of the N-glycosyl bond between deoxyribose and a purine base in DNA creates an apurinic (AP) site. An AP site is more thermodynamically destabilizing to a DNA molecule than is a mismatched base pair. Examine the structure of an AP site. HN H₂N N 0 Guanine -O-P-O-CH₂O. H₂N H HN H H H Hod H ofo -0- Guanosine residue (in DNA) -0-CH₂ H H H Apurinic residue H OH H
- If a DNA double helix contains 28% T nucleotides, then what is the percentage of A nucleotides?A sample of DNA contains 40% adenine-thymine bas e pairs altogether. What percentage of the DNA will contain the single base, cytosine? 20% 30% 40% 60% 80%The proposed model of the DNA double helix by Watson and Crick was based on earlier findings the DNA structure is a helix and that the number of bases or nucleotide C+A is always equal to G + T. With this in mind, what is the number of hydrogen bonds that hold this DNA helix with the following sequence: AGGTCTTCGTGGCCTA TCCAGAAGCACCGGAT 28 58 41 38