The most important force for stability of the DNA double helix is:   a.   Disulfide bond   b.   Hydrophilic interactions   c.   electrostatic interaction   d.   Base stacking

Which of the following types of DNA damage would be hardest to repair using the DNA repair pathways?A. Complete removal of three nucleotides in the middle of one strand.B. A covalent bond between a base on one strand and a base on the complementary strand.C. Incorporation of a sugar other than deoxyribose into one strand.D. Covalent attachment of a short polypeptide to a single base.E. A covalent bond between a base and a deoxyribose on the same strand.   Please explain why it's B

a. unwinds the DNA helix b. stabilizes and stops the two strands from annealing (rebinding with each other) c. recoils the DNA d. cleaves both strands of DNA to relieve tension at supercoils e. places RNA primers at their proper location on the template strands f. acts as starting points for DNA polymerase g. adds DNA nucleotides to form new DNA strands h. forms phosphodiester bonds to join Okazaki fragments Esc 1. single-strand binding protein 2. helicase 3. DNA ligase 4. RNA primer 5. gyrase 6. DNA polymerase 53°F Cloudy 3 Q Search $ F5 FR

N C N HC C GH CH N H Which base normally pairs with this structure: a. Thymine b. Adenine c. Cytosine d. Guanine

Which of the following statements about nucleic acids is not correct? Select one: A. In DNA the distance between the strands of the double helix is relatively constant. B. The growing DNA polymer is synthesized in the 5' to 3' direction. C. The enzymes that catalyze DNA synthesis are known as DNA polymerases. D. RNA strands are synthesized in the 3' to 5' direction. E. Unlike DNA, RNA is easily cleaved because the 2'-OH group of the ribose is a nucleophile that catalyzes hydrolysis of the strand.

Which of the following relations will be found in the percentages of bases of a double-stranded DNA molecule? a. A+T-G+C b. A+G=T+C A+C-G+T c. d. (A +T)/ (C+G) = 1.0 e. (A+G)/ (C+T)= 1.0 f. (A/C)=(G/T) g. (A/G)=(T/C) h. (A/T)=(G/C)

Select the options that describe the correct pairings of the nitrogen bases in the DNA molecule. SELECT ALL THAT APPLY   Select all that apply: A = T   T = G   C = A   G = C   A = G   C = T

In your own words describe the various types of bonds that are found in the structure of DNA and the roles they play in stabilizing the DNA molecule. Describe the chemical nature of the DNA molecule as best as you can.

The formation of pyrimidine dimers results from which of the following?  a. Spontaneous errors by DNA polymerase  b. Exposure to gamma radiation  c. Exposure to ultraviolet radiation  d. Exposure to intercalating agents

In Watson and Crick's model of DNA structure, the two strands of the DNA double helix are joined through   a. Ionic bonds   b. Hydrophobic interactions   c. Covalent bonds   d. Disulfide bonds   e. Hydrogen bonds