Concept explainers
(a)
To determine: If Chargaff’s rule implied that equal amounts of guanine and adenine are present in DNA.
Interpretation: Whether Chargaff’s rule implied that the equal amounts of guanine and adenine are present in DNA is to be stated.
Concept introduction: James and Watson in
According to Chargaff’s rule the DNA contains the equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine.
This means that
The pyrimidine bases are cytosine and thymine and purine bases are guanine and adenine that are present in DNA.
(b)
To determine: If Chargaff’s rule implied that the sum of purine residues equals the sum of pyrimidine residues.
Interpretation: Whether Chargaff’s rule implied that the sum of purine residues equals the sum of pyrimidine residues is to be stated.
Concept introduction: James and Watson in
According to Chargaff’s rule the DNA contains the equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine.
This means that
The pyrimidine bases are cytosine and thymine and purine bases are guanine and adenine that are present in DNA.
(c)
To determine: If Chargaff’s rule applied only to double-stranded DNA or it would also apply to individual strand if the double helical strand were separated into its two complementary strands.
Interpretation: Whether Chargaff’s rule applied only to double-stranded DNA or it would also apply to individual strand if the double helical strand were separated into its two complementary strands is to be stated.
Concept introduction: James and Watson in
According to Chargaff’s rule, the DNA contains the equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine.
This means that
The pyrimidine bases are cytosine and thymine and purine bases are guanine and adenine that are present in DNA.

Want to see the full answer?
Check out a sample textbook solution
Chapter 23 Solutions
ORGANIC CHEMISTRY MASTERINGCHEM ACCESS
- Identify the intermediate that is INITIALLY formed in a saponification reaction (hydrolysis of an ester). III -OH H₂O HO OH HO O || A B C III D IV IVarrow_forwardHelp me answer this practice sheet I found for an answer guidearrow_forwardshow the retrosynthesis of this molecule step by step starting with 1,3-dimethoxy benzene H3CO OH OH OCH 3arrow_forward
- Consider the reaction of a propanoate ester with hydroxide ion shown below. A series of four alcohol leaving groups were tested to determine which would be the best leaving group. Based on the pKa values of the alcohols, predict which alcohol would produce the fastest hydrolysis reaction. HO FOR A Alcohol I, pKa =16.0 B Alcohol II, pKa =10.0 C Alcohol III, pKa = 7.2 + ROH D Alcohol IV, pKa = 6.6arrow_forwardCurved arrows are used to illustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic step(s). Be sure to account for all bond-breaking and bond-making steps. :0: NaOH, H₂O 00:4 Na O heat NaO Select to Add Arrows Select to Add Arrows :0: Na a NaOH, H2O :0: NaOH, H2O heat heat Na ONH Select to Add Arrowsarrow_forwardCurved arrows are used to illustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic step(s). Be sure to account for all bond-breaking and bond-making steps. H CH3NH3+ :0: :0: HO CH3NH2 HH iSelect to Add Arrows i Select to Add Arrows i HH CH3NH3+ CH3NH2 Select to Add Arrows i CH3NH3 CH3NH2 ايكدا HH Select to Add Arrowsarrow_forward
- The reaction is carried out with gases: A → B + C at 300 K. The total pressure is measured as a function of time (table). If the reaction order is 2, calculate the rate or kinetic constant k (in mol-1 L s¹) Ptotal (atm) 492 676 760 808 861 t(s) 0 600 1200 1800 3000arrow_forwardcan someone give a description of this NMR including whether its a triplt singlet doublet where the peak is around at ppm and what functional group it representsarrow_forward1. Determine the relationship between the following molecules as identical, diastereomers, or enantiomers (6 points, 2 points each). OH OH OH A-A OH HOT HO- ACHN and HO- ACHN OH HO HO ° OH and OH OH SH and ...SHarrow_forward
- 20,0 Complete the electron pushing mechanism to y drawing the necomery unicaciones and carved on for Step 1: Add curved arms for the tint step, traiment with NalilĻ. The Nation 458 Step 2: Added for the second step, inalment with), how the "counterion bar Step 3: Daw the products of the last simplom organic and one incoganic spacient, including all nonbondingarrow_forwardplease provide the structure for this problem, thank you!arrow_forwardDraw the Fischer projection from the skeletal structure shown below. HO OH OH OH OH H Q Drawing Atoms, Bonds and Rings Charges I ☐ T HO H H OH HO I CH2OH H OH Drag H OH -CH2OH CHO -COOH Undo Reset Remove Donearrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
- Chemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub CoChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage LearningIntroductory Chemistry: An Active Learning Approa...ChemistryISBN:9781305079250Author:Mark S. Cracolice, Ed PetersPublisher:Cengage Learning




