A circular double-stranded DNA molecule contains 4200 base pairs. In solu-tion the molecule is in a B-form helix, with about 10.5 base pairs per turn.The DNA circle has 12 superhelical turns. What is its superhelix density o?

Given: The given molecular is DNA Number of base pairs=4200 Number of pairs in B-form helix= 10.5…

Answered: A circular double-stranded DNA molecule…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter23: The Chemistry Of Life

Section: Chapter Questions

Problem 98A

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Describe the structural differences between DNA and RNA. The monomers in nucleic acids are called nucleotides. What are the three parts of a nucleotide? The compounds adenine, guanine, cytosine, and thymine are called the nucleic acid bases. What structural features in these compounds make them bases? DNA exhibits a double-helical structure. Explain. Describe how the complementary base pairing between the two individual strands of DNA forms the overall double-helical structure. How is complementary base pairing involved in the replication of the DNA molecule during cell division? Describe how protein synthesis occurs. What is a codon, and what is a gene? The deletion of a single base from a DNA molecule can constitute a fatal mutation, whereas substitution of one base for another is often not as serious a mutation. Explain.
The base composition for one of the strands of a DNA double helix is 19% A, 34% C, 28% G, and 19% T. What is the percent base composition for the other strand of the DNA double helix?
22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?
. How many unique amino acid sequences are possible for a tripeptide containing only the amino acids gly, ala, and cys, with each amino acid occurring only once in each molecule?
22-85 Denaturation is usually associated with transitions from helical structures to random coils. If an imaginary process were to transform the keratin in your hair from an (-helix to a (-pleated sheet structure, would you call the process denaturation? Explain.
The base sequences in mRNA that code for certain amino acids are Glu: GAA, GAG Val: GUU, GUC, GUA, GUG Met: AUG Trp: UGG Phe: UUU, UUC Asp: GAU, GAC These sequences are complementary to the sequences in DNA. a. Give the corresponding sequences in DNA for the amino acids listed above. b. Give a DNA sequence that would code for the peptide trp-glu-phe-met. c. How many different DNA sequences can code for the tetrapeptide in part b? d. What is the peptide that is produced from the DNA sequence TACCTGAAG? e. What other DNA sequences would yield the same tripeptide as in part d?
Must the ratio of guanine to cytosine be 1:1 in RNA? Explain.
Imagine a single DNA strand containing a section with the following base sequence, 5’-GCATTGGC-3’. What is the base sequence of the complementary strand?
Deoxyadenosine monophosphate (dAMP) and guanosine monophosphate (GMP) are nucleotides. The similarities between dAMP and GMP are that they both have? -an alpha (central) carbon.-the same R group.-a phosphate group.-a pentose (5 sided) sugar-an amino group-a nitrogenous base.
Select the single best answer. The "melting point" of a DNA molecule is the temperature at which the double-helical strand breaks apart. Suppose you are given two DNA samples. One sample, sample A, contains 45% G-C base pairs, while the other sample, sample B, contains 64% G-C base pairs. The total number of bases is the same in each sample. Which of the two samples, sample A or sample B, has a higher melting point? sample A sample B The melting point is the same for both.

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A circular double-stranded DNA molecule contains 4200 base pairs. In solu- tion the molecule is in a B-form helix, with about 10.5 base pairs per turn. The DNA circle has 12 superhelical turns. What is its superhelix density o?