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- Which of the following is not true of a single nucleotide polymorphism?a. It is usually caused by a translocation mutation.b. It is usually caused by a nucleotide substitutionmutation.c. It may change the phenotype of an organism.d. It is inherited from parent to offspring.The sequence of bases in DNA can be altered by chemicalmutagens. These cause changes by:(a) Acting as base analogs and being incorporated intoDNA(b) Adding methyl groups to bases, leading to errors inbase pairing(c) Removing an amino group from a base(d) Being inserted into double-stranded DNA(e) All of theseWhich of the following is not a characteristic of Chargaff’s Rule #1? a states that T = A and G = C b states that the ratio of adenine to thymine is equal, as is the ratio of guanine to cytosine c is also termed Chargaff's ratio d states that DNA composition varies among species
- Chargaff studied the composition of DNA from different sources and found that a. the number of phosphate groups always equals the number of 5-carbon sugars. b. the proportions of A equal that of C and G equals T. c. the proportions of A equal that of T and G equals C. d. purines bind to pyrimidines.The following features is(are) the requirement(s) for homologous recombination tooccur:A) Very similar (homologous) DNA sequences are required.B) The site of exchange can be anywhere in the homologous sequences.C) Nucleotide sequences do not alter at the site of exchange.D) Enzymes are required to cut both strands of the double helix.E) All of the above.Which statement regarding transitions and transversions is TRUE? a) An adenine to guanine change is a transversion b) Transversions are more commonly found in nature that are transitions c) A cytosine to guanine change is a transition d) Transversions cause a distortion in the DNA double helix
- Which of the following is true? A. The stability of an RNA-DNA hybrid is generally tilted towards that of DNA than RNA B. RNA duplexes are more stable than DNA duplexes C. DNA duplexes are more stable than RNA duplexes D. DNA duplexes are less stable than RNA- DNA hybridWhich of the following regions of a genome would be most likely to be a SINGLE CRE? A. A section of DNA that is 10 base pairs long B. A section of DNA that is 50 base pairs long C. A section of DNA that is 200 base pairs long D. A section of DNA that is 1500 base pairs longThe figure below shows a polynucleotide:a) Label the 5' and the 3' end of the sequenceb) If a nucleotide were added to this polynucleotide, which end would it be added to?c) Is this an RNA or DNA strand? How do you know?
- If 30% of the bases in a DNA sequence are G, what percentage of bases would you expect to be A? 20% 30% 35% None of the aboveWhich of the following is not a feature of the DNA double helix?a. It obeys the AT/GC rule.b. The DNA strands are antiparallel.c. The structure is stabilized by base stacking.d. All of the above are features of the DNA double helix.Which of the following factors favors the formation of the Random DNA Coil? a Enthalpy b Base-Pairing c Phosphate group interactions d Stacking Energies